Double Dynamo Lesson Guide Fact Strategy Builders • Lesson 1 Guide
Double Dynamo Teacher Guide
Core Focus: Visualizing Doubles (e.g., 6+6) and Deriving Near-Doubles (e.g., 6+7)
WEEK 1
5-Day Sequence
Instructional Strategy
The Doubles Strategy relies on visual memory and symmetry. Rather than learning dry symbols, children recall symmetrical images (e.g., twin ten-frames, butterfly wings).
Near-Doubles (+1) relies on relational thinking: if 6+6=12, then 6+7 is just "one more" (12 + 1 = 13).
Materials Needed
• Group: Classroom Anchor Chart, dry-erase ten-frames, dual-sided counters.
• Individual: Worksheets A, B, and C.
• Centers: Center Cards (A), Dominoes (B), Task Cards (C), mirrors.
Common Traps
• Students count dots individually by ones.
• Applying +1 to the wrong addend.
DAY 1
Symmetry and Visual Doubles (0+0 to 5+5)
Daily Goal: Discover that doubles are made of two identical partners with no leftovers.
Step-by-Step Activity: "Twin Row Builders"
1. Distribute a double ten-frame to each student. Place 4 blue counters on the top row.
DAY 2
Extending the Doubles Anchor (6+6 to 10+10)
Daily Goal: See larger doubles as 5+5 plus some extra "twin" wings.
Step-by-Step Activity: "Double-Wing Counters or Beads"
1. Give partners a set of dual-sided (red/yellow) counters, or a two-color bead string.
DAY 3
Near-Doubles (Doubles + 1)
Daily Goal: Connect adjacent addition facts directly to their nearest known double.
Step-by-Step Activity: "The Plus-One Intruder"
1. Have students build 6+6 with connecting blocks (two towers of 6).
Fact Strategy Builders • Doubles & Near-Doubles Master Guide Page 1 of 2
Fact Strategy Builders • Lesson 1 Guide
Double Dynamo Teacher Guide
Core Focus: Visualizing Doubles (e.g., 6+6) and Deriving Near-Doubles (e.g., 6+7)
WEEK 1
5-Day Sequence
Day 4: Station Rotation Guide
Rotate every 12 minutes
Center A
Double Dynamo Cards
Material: Center Cards
Objective: Match equation cards with strategy helper clues and visual layouts.Setup: Lay out equation cards facedown.Play: Players take turns turning over two cards. If they reveal "6+7" and the helper card "Double 6 + 1", they keep the pair!
Center B
Double Domino Match
Material: Center B
Objective: Link physical dots to sums.Setup: Shuffle the printable domino cards and distribute 5 to each student.Play: Students play in domino style, placing a matching card down. They must match the double image (e.g., 6 and 6 dots) with the word prompt "Double 6" or the sum "12".
Center C
Mirror Magic Tasks
Material: Center C
Objective: Deconstruct symmetrical real-world scenarios.Setup: Place Task Cards on rings at the table.Play: Students read scenarios (e.g., "A Twin-Beast has 8 horns on each side.") and draw the "mirror block" or write the matching double/near-double equation.
DAY 5
Diagnostic Assessment & Strategy Tower Progress
1. Give students Double Dynamo Worksheet C . This is non-timed .Strategy Progress Tracker !
Small-Group Differentiation
Support (Concrete)
Limit to doubles within 10 (sums to 10).
Use physical handheld mirrors to reflect block towers.
Touch each block to verify "twins."
Extend (Abstract)
Introduce "Doubles + 2" strategy (6+8 = 6+6+2).
Write addition stories based on double scenarios.
Solve mental near-doubles up to 100 (e.g., 40 + 41).
Observational Look-Fors (Strategy over Speed)
Does the student say "I know 8 + 8 is 16, so 8 + 9 is 17!"? Mark progress based on reasoning choice . If they count back or rely on tally marks, schedule a support session.
Fact Strategy Builders • Doubles & Near-Doubles Master Guide Page 2 of 2
Double Dynamo Anchor Chart Math Strategy Anchor Chart
Double Dynamo
Unlock your facts by using what you already know!
1
The Core Doubles: Twin Partners
Doubles facts have two identical addends. They make perfect twin pairs!
4 + 4 = 8
Double Four is Eight!
6 + 6 = 12
Double Six is Twelve!
2
Near Doubles: The "Double plus 1" Power!
If the addends are adjacent (like 6 and 7), double the smaller number and add 1!
EQUATION 6 + 7
Think Strategy Double 6 + 1 (6 + 6) + 1
SUM 13
If I know...
5 + 5 = 10
I also know...
5 + 6 = 11
Because...
11 is just 1 more than 10!
Our Fluency Rule
We do not rush. We notice patterns and build mental pathways.
Double It + Check It
Double Dynamo Worksheet A Double Dynamo • Worksheet A
Focus: Exploring Symmetry, Visual Twin rows, and Pure Doubles facts (0+0 to 10+10)
Student Name
Date
Our Daily Strategy Reminder:
A Double Fact has two identical partner rows (twin row on top, twin row on bottom). Every counter has a matching twin underneath, leaving no lonely leftover counters!
Part 1: Build the Twin Row!
Look at the dots in the top row. Draw the exact same number of dots in the bottom row to build a double. Then write the equation.
Problem 1
3 + =
Problem 2
5 + =
Problem 3
4 + =
Problem 4
6 + =
Part 2: Solidify Your Doubles
Solve these pure doubles. Think of equal matching rows with NO leftover parts!
A 2 + 2 =
B 4 + 4 =
C 6 + 6 =
D 8 + 8 =
E 3 + 3 =
F 5 + 5 =
G 7 + 7 =
H 9 + 9 =
Part 3: Symmetrical Double Detectors!
Look at each card. Check the box to say whether the equation is a **true double** (twin rows) or **not a double**.
4 + 4
Double Not One
6 + 7
Double Not One
8 + 8
Double Not One
Rate Your Thinking:
How did finding equal matching rows feel today?
🐢 Quiet & Slow
🚀 Smooth Jump
Fact Strategy Builders • Student Worksheet Double Dynamo • Worksheet A
Double Dynamo Center Cards Math Centers Station
Double Dynamo Match Cards
Print on cardstock, laminate, and cut along dotted lines for games!
STATION A
How to Play "Double Match":
Shuffle the cards. Players take turns matching a Target Equation Card with its Helper Strategy Card and calculating the sum. Explain your reasoning aloud to your partner to win the match!
Equation Card
6 + 7 What is the sum?
Match Pair #1
Helper Card
Double 6 + 1 (6 + 6) + 1 = 13
Match Pair #1
Equation Card
5 + 6 What is the sum?
Match Pair #2
Helper Card
Double 5 + 1 (5 + 5) + 1 = 11
Match Pair #2
Equation Card
8 + 9 What is the sum?
Match Pair #3
Helper Card
Double 8 + 1 (8 + 8) + 1 = 17
Match Pair #3
Bonus Station Challenge
Draw Your Twin!
Choose an equation card. Draw its visual twin rows on the table's dry-erase boards before checking the answer card.
PARTNER
APPROVED
Fact Strategy Builders • Math Centers Double Dynamo • Station Materials
Double Dynamo Worksheet B Double Dynamo • Worksheet B
Focus: Extending doubles to Near-Doubles (Doubles + 1) and Doubles + 2
Student Name
Date
Strategy Lock: The Doubles + 1 and + 2 Jumps!
If you know a double, nearby facts are easy! For 5 + 6 (Doubles + 1), think: 5 + 5 = 10 , so 1 more is 11 . For 6 + 8 (Doubles + 2), think: 6 + 6 = 12 , so 2 more is 14 !
Part 1: Double Helpers
Solve these helper doubles. They are the springboard for today's strategy jumps!
A 5 + 5 =
B 7 + 7 =
C 8 + 8 =
D 6 + 6 =
Part 2: Jump Up by 1 or 2!
Complete the strategy paths. Read carefully to see if you need to add 1 more or 2 more.
Target Fact
5 + 6 =
I know that 5 + 5 = , so 5 + 6 is 1 more, which is .
Target Fact
7 + 8 =
I know that 7 + 7 = , so 7 + 8 is 1 more, which is .
Target Fact
6 + 8 =
I know that 6 + 6 = , so 6 + 8 is 2 more, which is .
Part 3: Twin Detectives
Connect the equation directly to its helper equation.
Target Fact
5 + 6
6 + 8
7 + 8
Double Helper +1 / +2
6 + 6 + 2
5 + 5 + 1
7 + 7 + 1
Rate Your Thinking:
How did jumping up by 1 or 2 feel today?
🐢 Still warming up
🚀 Mastered the jumps!
Fact Strategy Builders • Student Worksheet Double Dynamo • Practice 1B
Double Dynamo Worksheet C Double Dynamo • Practice C
Focus: Word problems, error analysis, and high-level double thinking
Student Name
Date
Part 1: Symmetry Story Problems
Read carefully and use a doubles strategy helper to solve.
1. An insect has 6 legs on its left side and 6 legs on its right side. How many legs does the insect have in total?
Helper Equation: + =
2. Leo has 7 stickers. His friend Sam has 8 stickers. How many stickers do they have altogether?
What helper double fact will you use?
Sum =
Part 2: Math Detective: Find the Mistake!
Read Mila's math thought below. Find and explain her mistake.
Mila's thought:
"To solve 7 + 8, I think of the helper double 7 + 7. Since 7 + 7 = 14, then 7 + 8 must be 14 too!"
What did Mila forget to do? Write your explanation below:
Part 3: Super Double Challenges!
Use your double patterns to solve these higher-level equations conceptually.
Challenge A 10 + 11 =
(Think: 10 + 10 + 1)
Challenge B 20 + 22 =
(Think: 20 + 20 + 2)
Rate Your Thinking:
How do you feel about helping Mila find her mistake?
🐢 Still a bit tricky
🚀 I'm a strategy detective!
Fact Strategy Builders • Student Worksheet Double Dynamo • Practice 1C
Double Dynamo Center B Math Centers Station
Double Domino Match
Print on cardstock, laminate, and cut along dotted lines for games!
STATION B
How to Play "Domino Match":
Shuffle the domino cards. Match the Visual Domino Card with its Sum & Double Strategy Card . Explain how the symmetrical dots show the double without counting them one by one!
Domino Visual
Match Domino #1
Strategy Card
5 + 5 = 10 Double 5 is Ten!
Match Domino #1
Domino Visual
Match Domino #2
Strategy Card
6 + 6 = 12 Double 6 is Twelve!
Match Domino #2
Bonus Station Challenge
Draw a Domino!
Choose a strategy card (e.g., 6+6=12). On your dry-erase board, sketch the domino with the matching symmetrical spots!
PARTNER
APPROVED
Fact Strategy Builders • Math Centers Double Dynamo • Domino Materials
Double Dynamo Center C Math Centers Station
Double Symmetry Action Quest
Solve these visual scenario cards together with your companion explorer!
STATION C
Quest Instructions:
Pick a card. Draw or build the story using your block kit on the table. Show your partner your model, write down the helper double equation, and find the solution.
Quest Card 1 👹
The Twin-Beast Horns
A friendly forest beast has two identical heads. Each head has 7 horns . How many horns does the Twin-Beast have altogether?
• Draw 7 and 7 on your frame.
• Write: =
Double Symmetry Quest
Quest Card 2 🔮
The Mirror Magic
You place 8 magical glass blocks on the table. When you look in the magic mirror, you see another 8 identical blocks. How many blocks can you see in total?
• Build 8 blocks + see 8 mirror blocks.
• Write: =
Double Symmetry Quest
Quest Card 3 🎲
The Double Dice Duel
You roll two dice and they both land on 6 . What is your total score? What would your score be if one dice nudged over to 7 ?
• Helper Double: 6 + 6 =
• Near Double: 6 + 7 =
Double Symmetry Quest
Quest Card 4 🏴☠️
The Pirate Shipwreck
A sunken pirate chest has 9 gold coins in the top compartment and 10 gold coins in the bottom compartment. Find the total using a helper double.
• Helper Double:
• Total Coins:
Double Symmetry Quest
Fact Strategy Builders • Math Centers Double Dynamo • Action Quest Task Cards
Bridge Builders Lesson Guide Fact Strategy Builders • Lesson 2 Guide
Bridge Builders Teacher Guide
Core Focus: Bridging Through Ten for Addition (8+5 = 10+3) and Subtraction (13-5 = 13-3-2)
WEEK 2
5-Day Sequence
Instructional Strategy
The Bridge to Ten strategy anchors arithmetic in base-ten. To solve equations like 8+5, students decompose 5 into 2+3 to fill the ten-frame first.
This turns complex equations into friendly, visual 10 + n layouts, preventing count-by-one habits.
Materials Needed
• Group: Classroom Anchor Chart, pocket ten-frames, dual-sided counters.
• Individual: Worksheets A, B, C, Number Bond Handout (scaffold).
• Centers: Sorting Mats (A), Number Lines (B), Cargo Ship Boards (C).
Common Traps
• Decomposing the second addend incorrectly (e.g., separating 5 into 1+4).
• Losing track of leftover ones.
DAY 1
Landmark Partners to Ten
Daily Goal: Master the combinations of numbers that make exactly ten instantly.
Step-by-Step Activity: "Partners to Ten Flash"
1. Hold up a ten-frame with 7 red counters visible.
DAY 2
Bridging Addition (e.g., 8 + 5 = 10 + 3)
Daily Goal: Decompose a small addend to fill a ten-frame first, then add the leftovers.
Step-by-Step Activity: "Fill the Frame Cargo" Warm-up: Number Bond Handout
1. Pre-Teach: If students are unfamiliar with splitting numbers, use the Number Bond Breakdowns Handout as a 10-minute guided warm-up first.Decompose: Display 8 + 5. Ask: "8 needs 2 to fill our ten-frame. How can we split our 5 to give 2 to the 8?" Split 5 into a number bond of 2 and 3.Fill: Slide 2 counters to fill the ten-frame (making 10). Keep 3 loose on the side.Rewrite & Solve: Write: 10 + 3 = 13. Complete Bridge Builders Worksheet B.
DAY 3
Bridging Subtraction (e.g., 13 - 5 = 13 - 3 - 2)
Daily Goal: Decompose a subtrahend to drop down to ten first, then subtract remaining parts.
Bridge Builders Anchor Chart Math Strategy Anchor Chart
Bridge to Ten
Make Ten first to turn hard facts into super-easy +10 facts!
1
Addition: Decompose & Fill!
8 + 5 = 13
Split the 5:
2 To make 10
3 Leftover
Step 1: 8 + 2 = 10
Step 2: 10 + 3 = 13
Ten-Frame #1 (Full!)
Ten-Frame #2 (Leftovers)
2
Subtraction: Break Down to Ten!
13 - 5 = 8
Split the 5:
3 To reach 10
2 Rest to subtract
Step 1: 13 - 3 = 10
Step 2: 10 - 2 = 8
Ten-Frame #1 (10 counters - minus 2)
X
X
Ten-Frame #2 (3 counters - minus 3)
X
X
X
Our Ten Rule
Ten is our safe harbor! We always land on ten to make math simple.
Decompose & Build
Bridge Builders Worksheet A Bridge Builders • Worksheet A
Focus: Mastering Landmark Partners to Ten (Combinations that make exactly 10)
Student Name
Date
Our Daily Strategy Reminder:
Ten is our friendly landmark number! Before we can "bridge" through ten, we must know exactly how to fill the ten-frame to make ten instantly without counting on our fingers.
Part 1: Fill the Ten-Frame!
Look at the red counters. **Draw empty circles (◯) to fill the empty spaces** in the ten-frame to make exactly ten. Then complete the equation.
Problem 1
8 + = 10
Problem 2
7 + = 10
Problem 3
9 + = 10
Problem 4
6 + = 10
Part 2: Number Bonds of Ten
Fill in the missing part to complete the part-part-whole number bond for 10.
10
5
?
10
8
?
10
9
?
10
6
?
10
7
?
Part 3: Subtraction from Ten Landmark
Take away from 10 to find the missing partner. No counting back!
A
10 - 2 =
B
10 - 4 =
C
10 - 1 =
D
10 - 3 =
Rate Your Thinking:
How did finding landmark partners feel today?
🐢 Quiet & Slow
🚀 Smooth Jump
Fact Strategy Builders • Student Worksheet Bridge Builders • Worksheet A
Bridge Builders Center Mats Math Centers Station
Bridge Builders Sorting Mat
Categorize equations based on whether they bridge the landmark number 10.
STATION A
YES! Bridges 10
Place equations here if they must cross over the number 10 to be solved (e.g., 8 + 5, 13 - 5).
Drop Matching Cards Here
NO! Simple Steps
Place equations here if they do not cross the 10 threshold (e.g., 5 + 3, 14 - 2).
Drop Matching Cards Here
Partner Explanation Prompt:
When sorting, you must tell your partner: "This equation bridges 10 because..." or "This doesn't bridge 10 because..." . Partners must agree before placing the card.
Cut Out These Cards:
Card #1
8 + 4
Card #2
7 + 5
Card #3
14 - 6
Card #4
5 + 3
Card #5
6 + 2
Card #6
15 - 2
Bonus Station Challenge
Draw the Split!
Choose a "YES" card. On your station dry-erase board, draw the split/number bond to show how you reach the ten.
PARTNER
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Fact Strategy Builders • Math Centers Bridge Builders • Station Materials
Bridge Builders Worksheet B Bridge Builders • Practice B
Focus: Bridging with 9+ and 8+ facts using visual aids
Student Name
Date
Our Strategy Target: The 10+n Rewriter!
To solve 9 + 6 , slide 1 over from the 6 to make 10 + 5 . The sum is 15 ! To solve 8 + 7 , slide 2 over to make 10 + 5 . The sum is 15 !
Part 1: Rewrite into Ten Facts
Slide numbers over conceptually to turn these into easy 10 + n facts.
9 + 5
10 +
=
8 + 5
10 +
=
9 + 7
10 +
=
Part 2: Draw to make 10
Draw counters in the ten-frames to prove your equation. Draw circles (◯) to fill up to 10 first.
8 + 4 =
Fill the dashed circles first!
9 + 4 =
Fill the dashed circles first!
Part 3: Bridge Story Problems
Read carefully. Decompose the smaller number to make ten.
Maya has 8 green apples and 6 red apples . How many apples does she have in total? Show how you split the 6 to make ten first.
Split 6 into: 2 and
Equation: 8 + 2 + =
Rate Your Thinking:
How do you feel about writing 10+n facts?
🐢 Still a bit tricky
🚀 Rewriting makes it simple!
Fact Strategy Builders • Student Worksheet Bridge Builders • Practice 2B
Bridge Builders Worksheet C Bridge Builders • Worksheet C
Focus: Comprehensive Unit Checkpoint, Subtraction Bridging & Strategy Extensions
Student Name
Date
Strategy Lock: Drop to Ten!
To solve 13 - 5 , drop to 10 first! Split 5 into 3 and 2 . Subtract 3 to reach 10: 13 - 3 = 10 . Then, subtract the remaining 2: 10 - 2 = 8 !
Part 1: Decompose the Subtrahend
Split the second number so you can drop down to exactly 10 first.
1. TARGET FACT 14 - 6 =
• Split 6 into 4 and
• Step 1: 14 - 4 = 10
• Step 2: 10 - =
2. TARGET FACT 15 - 7 =
• Split 7 into 5 and
• Step 1: 15 - 5 = 10
• Step 2: 10 - =
Part 2: Math Detective: Find the Mistake!
Read Eli's thought on subtraction. What did Eli do wrong?
Eli's thought:
"To solve 14 - 6, I split 6 into 3 and 3. Then I subtracted 14 - 3 = 11, and then 11 - 3 = 8."
Why should Eli have split 6 into 4 and 2 instead of 3 and 3? Explain below:
Part 3: Solve & Super Challenges!
Apply your bridging strategy to solve. Then try the super-ten landmark challenge!
Fact A
13 - 4 =
Fact B
16 - 7 =
Super Tens 100-Bridge
80 + 50 =
Rate Your Thinking:
How do you feel about your strategy progress throughout this base-ten unit?
🐢 Still practicing
🚀 I am a 10-Bridge Master!
Fact Strategy Builders • Student Worksheet Checkpoint Bridge Builders • Worksheet C
Bridge Builders Center B Math Centers Station
Bridge Board Walk Task Cards
Practice tracing jumps to the landmark 10 on open number lines!
STATION B
How to Play "Board Walk":
Pick a card. Use a dry-erase marker to draw the hops to 10 first, then hop the rest. Write out the final equation on your record sheet.
Board Walk 1 🌉
Target Addition: 8 + 5
8 10 13
• Hop +2 to reach 10. (8 + 2 = 10)
• Hop +3 more to reach 13. (10 + 3 = 13)
Bridge Board Walk
Board Walk 2 🌉
Target Addition: 9 + 4
9 10 13
• Hop +1 to reach 10. (9 + 1 = 10)
• Hop +3 more to reach 13. (10 + 3 = 13)
Bridge Board Walk
Board Walk 3 🌉
Target Subtraction: 13 - 5
8 10 13
• Hop back -3 to reach 10. (13 - 3 = 10)
• Hop back -2 to reach 8. (10 - 2 = 8)
Bridge Board Walk
Board Walk 4 🌉
Target Subtraction: 12 - 4
8 10 12
• Hop back -2 to reach 10. (12 - 2 = 10)
• Hop back -2 to reach 8. (10 - 2 = 8)
Bridge Board Walk
Fact Strategy Builders • Math Centers Bridge Builders • Open Number Lines
Bridge Builders Center C Math Centers Station
Cargo Ship Ten-Builder
Practice partitioning cargo crates to fill the main container deck (10 units)!
STATION C
Station Cargo Rules:
Place the primary cargo crate on the ship. Splitting the secondary crate, slide exactly enough items to fill the main deck (10 spaces). Place the remaining secondary items on the barge!
🚢 SS Landmark Ten (Main Deck)
Must hold exactly 10 crates before setting sail!
10-Crate Container Deck
⛵ Leftover Cargo Barge
Holds any leftover crates that didn't fit on the SS Ten.
Leftover Overflow Area
Printable Cargo Crates (Cut along dashed lines):
Cargo A
8 Crate Block
Leaves 2 empty slots on ship
Cargo B
5 Crate Block
Splits into 2 (for ship) & 3 (for barge)
Bonus Station Challenge
Write the Manifest!
Choose Cargo A & Cargo B. Solve: 8 + 5. Write the ship's equation: 8 + 2 + 3 = 13 on the station whiteboard.
PARTNER
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Fact Strategy Builders • Math Centers Bridge Builders • Cargo Ship Ten-Builder
Number Bond Breakdowns Handout Number Bond Breakdowns Handout
Scaffolding Companion • Focus: Understanding Parts and Wholes
Student Name
Date
Part 1: What is a Number Bond?
10 Whole
7 Part
3 Part
A Number Bond is a picture that shows how a larger number (the Whole ) can be split apart into smaller numbers (the Parts ).
If you add the two Parts together, you make the Whole ! (\(7 + 3 = 10\))
If you take one Part away from the Whole , you find the other part! (\(10 - 7 = 3\))
Part 2: Decomposing a Number in Different Ways
We can split the same number into different part combinations. Look at the number 5 below:
Way A
5
1
4
1 + 4 = 5
Way B
5
2
3
2 + 3 = 5
Way C
5
0
5
0 + 5 = 5
Part 3: Guided Practice - Build Your Own!
Fill in the blank part circles to make each number bond true!
4
3
?
6
2
?
8
6
?
7
5
?
Landmark Connection (Why are we doing this?)
In Day 2's lesson, you will see equations like 8 + 5 . Since 8 needs 2 to fill the ten-frame (make 10), we will write a number bond to split 5 into 2 and 3 !
Fact Strategy Builders • Extra Scaffold handout Bridge Builders • Number Bond Companion
Think Addition Lesson Guide Fact Strategy Builders • Lesson 3 Guide
Think Addition Teacher Guide
Core Focus: Leveraging Strong Addition Pathways to Solve Subtraction Facts (e.g., 12-7 as "7 + ? = 12")
WEEK 3
5-Day Sequence
Instructional Strategy
The Think-Addition strategy shifts subtraction from a slow counting-back habit to a relational missing-addend puzzle.
Mentally framing 12-7 as "7 plus what makes 12?" taps into stronger addition neural pathways, raising recall rates.
Materials Needed
• Group: Classroom Anchor Chart, painter's floor tape, linking blocks, whiteboards.
• Individual: Worksheets A, B, C, Strategy Tracker sheet.
• Centers: Puzzles (A), Secret decoders (B), Domino Chains (C).
Common Traps
• Counting back on fingers and landing 1 value off.
• Confusing the parts and whole in the model.
DAY 1
The Part-Part-Whole Blueprint
Daily Goal: See that any subtraction fact is a search for a missing partner part.
Step-by-Step Activity: "The Tape Model Runway"
1. Use masking tape to draw a giant part-part-whole bar model on the classroom floor.
DAY 2
Think Addition with Doubles (Sub-Doubles)
Daily Goal: Match subtraction equations directly to known addition doubles (e.g., 14 - 7 as 7 + 7 = 14).
Step-by-Step Activity: "Half-Tower Doubles Match"
1. Hand out 14 blocks. Direct students to build a single tall tower.
DAY 3
Think Addition with Making Ten
Daily Goal: Bridge up to ten from the part to find the missing whole difference (e.g., 13 - 8).
Step-by-Step Activity: "The Jump-Up Ladder"
1.
Think Addition Anchor Chart Math Strategy Anchor Chart
Think Addition!
Don't count backwards! Use your addition facts to crush subtraction.
1
The Missing Addend Method
SUBTRACTION FACT 12 - 7 = ?
Think: 7 + 5 = 12
"Since I know that 7 + 5 = 12 , I also know instantly that 12 - 7 = 5 !"
Whole 12
Known Part 7
Missing Part 5
2
Subtraction Doubles (Sub-Doubles)
SUBTRACTION FACT 16 - 8 = ?
Think: 8 + 8 = 16
"Since I know my doubles: 8 + 8 = 16 , I also know that 16 - 8 = 8 !"
Whole 16
Known Part 8
Twin Part 8
Our Think-Addition Key
Subtraction is just addition backwards. Tap into your addition patterns!
Reverse It & Master It
Think Addition Worksheet A Think Addition • Worksheet A
Focus: Part-Part-Whole structures and writing complete Fact Families
Student Name
Date
Our Daily Strategy Reminder:
Every subtraction equation has a matching addition partner! By mapping numbers into a Part-Part-Whole bar, we can see how addition and subtraction are family members that solve each other!
Part 1: Find the Missing Part!
Fill in the missing box in the bar model. Then solve the subtraction sentence.
12
8
?
Problem 1
12 - 8 =
Think: 8 + = 12
11
9
?
Problem 2
11 - 9 =
Think: 9 + = 11
15
6
?
Problem 3
15 - 6 =
Think: 6 + = 15
14
7
?
Problem 4
14 - 7 =
Think: 7 + = 14
Part 2: Complete the Fact Families!
Write the four related family equations (2 addition, 2 subtraction) for this completed bar model.
13
8
5
Addition 1 8 + 5 = 13
Addition 2 5 + =
Subtraction 1 13 - 5 = 8
Subtraction 2 13 - =
Part 3: Match the Addition Partner
Draw a line connecting each subtraction fact to the missing-addend addition partner that solves it.
Subtraction Fact
12 - 5
14 - 6
11 - 3
Addition Partner
3 + ? = 11
5 + ? = 12
6 + ? = 14
Rate Your Thinking:
Did the part-part-whole bars help you link addition and subtraction today?
🐢 Quiet & Slow
🚀 Smooth Jump
Fact Strategy Builders • Student Worksheet Think Addition • Worksheet A
Think Addition Center Puzzles Math Centers Station
Think Addition Connect Puzzles
Print, laminate, and cut along dashed wavy lines. Students connect subtraction to addition!
STATION A
Center Rules: Three-Part Connection:
Mix up all pieces. Students must find the three matching parts that belong together: the Subtraction Problem , the Part-Part-Whole Bar Model , and the Think-Addition Missing Addend fact.
Puzzle Set #1
SUBTRACTION 13 - 7 Part A
BAR MODEL
13
7
? (6)
Part B
ADDITION KEY 7 + ? = 13 Part C
Puzzle Set #2
SUBTRACTION 11 - 5 Part A
BAR MODEL
11
5
? (6)
Part B
ADDITION KEY 5 + ? = 11 Part C
Puzzle Set #3
SUBTRACTION 15 - 8 Part A
BAR MODEL
15
8
? (7)
Part B
ADDITION KEY 8 + ? = 15 Part C
Bonus Station Challenge
Draw Your Strategy Route!
Choose a Subtraction card. Explain to your partner whether you solved it using "Doubles Strategy" or "Bridge to Ten Strategy" addition helper.
PARTNER
APPROVED
Fact Strategy Builders • Math Centers Think Addition • Puzzle Materials
Think Addition Worksheet B Think Addition • Worksheet B
Focus: Solving Subtraction Doubles (Sub-Doubles) using symmetrical addition helpers
Student Name
Date
Strategy Lock: Split the Doubles!
A subtraction double is when you take away exactly half of an addition double! If you know that 7 + 7 = 14 , then taking away 7 leaves the other twin behind: 14 - 7 = 7 !
Part 1: Symmetrical Addition Friends
Solve these addition doubles as fast as your brain can snap!
A 5 + 5 =
B 7 + 7 =
C 8 + 8 =
D 6 + 6 =
Part 2: Split the Symmetrical Bars!
Look at the doubles bar. Fill in the missing twin part and complete the equations.
14
7
?
Problem 1
14 - 7 =
Think: 7 + 7 = 14
16
8
?
Problem 2
16 - 8 =
Think: 8 + 8 = 16
12
6
?
Problem 3
12 - 6 =
Think: 6 + 6 = 12
18
9
?
Problem 4
18 - 9 =
Think: 9 + 9 = 18
Part 3: Symmetrical Story Problems
Read carefully and use a symmetrical addition helper double to solve.
1. An insect has 12 legs in total . If 6 legs are on its left side, how many legs are on its right side?
Helper Equation: 6 + =
2. Leo and Sam have 16 stickers in total . If Leo has 8 stickers and the rest belong to Sam, how many does Sam have?
What helper double fact will you use? 8 + 8 = 16
Stickers =
Rate Your Thinking:
How did solving with doubles feel today?
🐢 Still practicing
🚀 Doubles are a snap!
Fact Strategy Builders • Student Worksheet Think Addition • Worksheet B
Think Addition Worksheet C Think Addition • Worksheet C
Focus: Comprehensive Unit Checkpoint, Strategy Decisions & Addition-Hero Jumps
Student Name
Date
Our Ultimate Strategy Hunt!
Now that you know both Doubles and Bridge to Ten , you have the ultimate subtraction toolkit! Choose the helper addition fact that feels easiest for each problem.
Part 1: Choose Your Helper!
Look at each subtraction fact. Decide if a Double helper or a Bridge to Ten helper is easiest. Tick your strategy choice!
1. TARGET FACT
14 - 7 =
Doubles (7+7=14)
Bridge to 10 (7+3+4=14)
2. TARGET FACT
12 - 9 =
Doubles (9+9=18... wait!)
Bridge to 10 (9+1+2=12)
Part 2: Explain Your Power!
Solve this subtraction fact and write out your exact addition thought process.
How would you solve: 13 - 8 =
Describe your helper addition strategy (What did you think?):
Part 3: Solve & Super Challenges!
Solve these mixed facts conceptually. Then try the super addition-hero multiple checkpoint!
Fact A
11 - 6 =
Fact B
15 - 9 =
Super Tens Relational
95 - 45 =
Rate Your Thinking:
How do you feel about choosing between addition helper strategies?
🐢 Still practicing
🚀 I can choose easily!
Fact Strategy Builders • Student Worksheet Checkpoint Think Addition • Worksheet C
Think Addition Center B Math Centers Station
Subtraction Code Decoders
Print on cardstock, laminate, and cut along dotted lines for games!
STATION B
How to Play "Code Decoders":
Shuffle the cards. Players draw a Locked Subtraction Card , search for the matching Addition Decoder Key , and calculate the missing code number. Explain how addition unlocks the code!
Locked Code
12 - 5 = ? Find the addition helper key!
Lock Pair #1
Decoder Key
5 + [ ? ] = 12 Code is [ 7 ]!
Lock Pair #1
Locked Code
14 - 6 = ? Find the addition helper key!
Lock Pair #2
Decoder Key
6 + [ ? ] = 14 Code is [ 8 ]!
Lock Pair #2
Locked Code
11 - 4 = ? Find the addition helper key!
Lock Pair #3
Decoder Key
4 + [ ? ] = 11 Code is [ 7 ]!
Lock Pair #3
Bonus Station Challenge
Create a Lock!
Choose an addition card you know. On a card, write it backwards as a Subtraction Lock for your partner to decode!
PARTNER
APPROVED
Fact Strategy Builders • Math Centers Think Addition • Code Decoder Cards
Think Addition Center C Math Centers Station
Part-Part-Whole Chain dominoes
Print on cardstock, laminate, and cut along dotted lines for games!
STATION I
How to Play "Chain Dominoes":
Connect the cards end-to-end like real dominoes. Each card block has a Subtraction Problem on the left and a Part-Part-Whole Bar Model on the right. Match the right side of one card to the left side of another by finding the fact family connection!
Domino Card A
13 - 6 Find the family model!
11
5
? (6)
Connects to: 11 - 5 or 11 - 6
Domino Card B
15 - 8 Find the family model!
13
6
? (7)
Connects to: 13 - 6 or 13 - 7
Domino Card C
11 - 5 Find the family model!
15
8
? (7)
Connects to: 15 - 8 or 15 - 7
Fact Strategy Builders • Math Centers Think Addition • Domino Chain Materials
Strategy Progress Tracker 🏰 THE STRATEGY MASTER TOWER 🏰
Color your way up the tower! Climb from the ground floor to the Golden Throne!
Explorer:
Stamp Box Colored!
👑
10
Strategy Match & Choose
Think Addition • Level 3 (Worksheet C)
9
Subtraction Doubles
Think Addition • Level 2 (Worksheet B)
8
Part-Part-Whole Bars
Think Addition • Level 1 (Worksheet A)
7
Bridge Subtraction
Bridge Builders • Level 3 (Worksheet C)
6
Bridge Addition
Bridge Builders • Level 2 (Worksheet B)
5
Partners to Ten
Bridge Builders • Level 1 (Worksheet A)
4
Doubles Plus Two
Double Dynamo • Level 4 (Worksheet B)
3
Near Doubles (+1)
Double Dynamo • Level 3 (Worksheet B)
2
Higher Doubles (6-10)
Double Dynamo • Level 2 (Worksheet A)
1
Core Doubles (0-5)
Double Dynamo • Level 1 (Worksheet A)
The Ultimate Milestone
THE GOLDEN CASTLE
Color this milestone castle when you climb all 10 strategy floors!
📜
Quest Logs
Collect a physical ink stamp or star sticker ★ from your teacher inside each floor's dotted stamp box when you finish the matching worksheet!
"Steady and conceptual wins the math race!"
🏁 THE GOLDEN CHEST OF MATH POWER! 🏁
When all 10 steps of your tower are stamped, you have climbed the entire Master Tower! Color the giant treasure chest and have your teacher stamp your master license!
Approved ⭐
Fact Strategy Builders • Math Adventure Color-In Strategy Tower & Milestone Tracker
