Regrouping Rulz Lesson Plan Regrouping Rulz!
Session 1: Mastering Tens and Ones
40 Minutes
The Big Why
Regrouping is a fundamental skill that builds a strong foundation for more complex arithmetic. Mastering it helps students develop number sense, understand place value deeply, and confidently solve real-world problems.
Learning Objective
Students will understand and apply the concept of regrouping (borrowing and carrying) in two-digit addition and subtraction problems, demonstrating proficiency through guided practice and independent work.
Teacher Preparation
• Review the Slide Deck and Script thoroughly.
• Gather Base Ten Blocks or other appropriate manipulatives (e.g., craft sticks, bundles of ten).
• Print all worksheets, quizzes, and reading materials.
• Pre-assign partners or small groups, especially to support students with learning disabilities.
Materials
Whiteboard & Projector
Base Ten Blocks
Warm-Up Sheet
Worksheets & Games
Quiz & Test Pack
Instructional Steps
05 Minutes
Warm Up: How Many?
Distribute the warm-up activity. Focus on identifying tens and ones and review answers as a class to reinforce place value.
Review Place Value
10 Minutes
I Do: Introduction
Use the slide deck to introduce regrouping. Model several examples of two-digit addition and subtraction with manipulatives and the written algorithm.
Modeling
15 Minutes
We Do: Guided Practice
Guide students through problems collaboratively. Use manipulatives and facilitate discussions. Provide targeted support for students with learning disabilities.
Collaboration
15 Minutes
You Do: Independent Work
Students complete the worksheet and engage in the "Build It, Solve It" activity and "Trade & Solve" game. Offer extended time and individual assistance.
Independence
10 Minutes
Assessment & Wrap-Up
Administer the quiz and conclude with the "One Big Idea" cool-down. The test can be saved for a later session.
Evaluation
Regrouping Warm Up How Many How Many?
Regrouping Warm Up
Name:
Date:
Objective
Activate your prior knowledge about place value! Count the blocks and identify the tens and ones.
Instructions
Look at the number of objects shown in each box.
Count the tens and ones.
Write the total number.
Example
Tens: 1
Ones: 3
Total: 13
Your Turn!
Question 1
Tens:
Ones:
Total:
Question 2
Tens:
Ones:
Total:
Question 3
Empty
Tens:
Ones:
Total:
Regrouping Rulz Slide Deck Regrouping Rulz!
The Power of Place Value
Tens and Ones Review
Back to the Basics
T Tens Place
How many **groups of ten** do you have?
O Ones Place
How many **single units** do you have?
KEY IDEA
When you have 10 or more 'ones', you can REGROUP them into a 'ten'!
Teacher Model (I Do)
Adding with Regrouping
27 + 15 = ?
**Start with Ones:** 7 + 5 = 12
**Regroup:** 12 ones = 1 ten & 2 ones
Write the **2** in the ones place
**Carry** the 1 ten to the tens place
**Add Tens:** 1 + 2 + 1 = 4
1
27
+ 15
42
Class Practice (We Do)
Your turn to help me!
38 + 24 = ?
?
What do we add first?
?
What happens when we get 12?
?
Now add the tens!
38
+ 24
??
Teacher Model (I Do)
Subtracting with Regrouping
43 - 17 = ?
Step 1: The Ones Place
Can we take 7 from 3? **No!** We need more ones.
Step 2: Regroup a Ten
Take 1 ten. 4 tens becomes **3 tens**. Add 10 ones. 3 becomes **13 ones**.
Step 3: Subtract
13 - 7 = **6 ones**. 3 - 1 = **2 tens**.
3 13
43
- 17
26
Class Practice (We Do)
Let's subtract together!
52 - 28 = ?
DISCUSSION TIME
1. Can we take 8 from 2? (No! What do we do?)
2. Regroup a ten! (5 tens becomes ?)
3. Subtract the ones!
4. Subtract the tens!
52
- 28
??
Show What You Know!
Worksheet
Activities
Game
YOU GOT THIS!
Regrouping Script Facilitation Guide Teacher Script
Regrouping Rulz! • Facilitation Guide
TEACHER ONLY
Scripted Dialogue
Teacher Actions
Student Checks
SLIDE 1
Introduction: Superpower Unlock
"Good morning, mathematicians! Today, we're going to unlock a super cool math superpower called **regrouping**! Have you ever heard that word before? It might sound tricky, but it's actually a way to make addition and subtraction much easier, especially when numbers get a little bigger."
"Regrouping is like a magic trick where we swap numbers around to help us solve problems. By the end of this lesson, you'll be a regrouping pro!"
SLIDE 2
Reviewing Tens and Ones
Teacher Action
Distribute the "How Many?" warm-up. Allow 3-5 minutes for completion.
"Take a few minutes to complete the 'How Many?' warm-up. And remember, it's okay to think out loud or use your fingers if you need to."
Checking Question 2
"Uh oh! We have more than 9 ones! What can we do with those 12 ones?" (Wait for "bundle them up" or "trade for a ten")
SLIDE 3 & 4
Adding (I Do & We Do)
Modeling Step (I Do)
"Look at 27 + 15. I always start with the **ones place**. I have 7 + 5. That's 12! Can I put 12 in the ones column? (Shake head) Why not? Because the ones column only holds numbers from 0 to 9! So, I regroup."
Teacher Action
Model the written carrying process. Draw the small '1' above the tens column with emphasis.
Guided Practice (We Do)
"Alright, where do we always start? (Pause for: Ones place) What's 8 + 4? (Pause for: 12) Perfect! How do we regroup 12 ones? (Pause for: 1 ten and 2 ones) Awesome!"
SLIDE 5 & 6
Subtracting (I Do & We Do)
"Regrouping also helps us with subtraction! Sometimes we don't have enough ones to take away. This is often called 'borrowing', but remember, we're really just **regrouping**!"
Checking for Understanding
"In 52 - 28, can we take 8 from 2? (No!) What should we do then? (Pause for: Regroup from the tens place!) Excellent thinking!"
Teacher Action
Cross out the 5 tens on the board. Change it to 4. Add the 10 ones to the 2. Make it a visible, dramatic change.
SLIDE 7
Transition to Practice
"You've seen me do it, we've done it together, and now it's your turn to shine independently! Use your Base Ten Blocks, work at your own pace, and let me know if you have any questions!"
Differentiation Note
Circulate specifically to students with learning disabilities. Check their manipulative setups. Ensure they have traded correctly before they move to the written portion.
Regrouping Reading The Power of Tens Math Discovery
The Power of Tens
A Guide to Regrouping
Have you ever played a game where you had to trade small pieces for bigger pieces? Like trading ten pennies for a dime? Or ten single Lego bricks for one long Lego brick?
That's exactly what we do in math when we regroup! It's a super helpful math trick we use when we add or subtract numbers that are too big for their place.
...
10 Ones = 1 Ten
Why do we regroup?
Numbers are made of different places: the **ones place** and the **tens place**. The ones place can only hold digits from 0 to 9.
Imagine you have 12 apples. You can't put "12" in the ones place because it's too big! So, you put 10 of those apples into a basket. Now you have **1 basket of ten** and **2 single apples** left over.
Addition
Carrying Over
1 **Add the Ones:** If 7 + 5 = 12...
2 **Regroup:** 12 ones is 1 ten & 2 ones. Write the **2**.
3 **Carry the Ten:** Put that 1 ten over in the tens column!
4 **Add Tens:** Add the tens including the carried one.
Subtraction
Borrowing
1 **Check Ones:** If 3 - 7 is impossible...
2 **Go Next Door:** Go to the tens place for help.
3 **Regroup:** Take 1 ten. It becomes **10 ones**. Add them to your 3 ones to get **13**.
4 **Subtract:** 13 - 7 = 6!
Regrouping is like exchanging money – you trade small for big!
Regrouping Activity Build It Solve It Handout Build It, Solve It!
Hands-On Activity Lab
Name:
Date:
Activity Goal
Physically model addition and subtraction using Base Ten Blocks to see the regrouping happen!
Part 1
Adding with Blocks
1
**Pick a problem:** Choose 36 + 18 or 29 + 25.
2
**Build it:** Use blocks to build the first number.
3
**Add:** Put down the blocks for the second number.
!
**Regroup:** If you have 10+ ones, trade them for 1 ten block!
Show Your Solution
My Problem:
Total Tens:
Total Ones:
Final Sum:
Part 2
Subtracting with Blocks
1
**Pick a problem:** Choose 41 - 15 or 53 - 27.
!
**Trade:** If you don't have enough ones, trade 1 ten for 10 ones!
2
**Subtract:** Take away the ones, then take away the tens.
Show Your Solution
My Problem:
Ones Left:
Tens Left:
Difference:
Remember: You can always use your blocks if a problem looks tricky!
Regrouping Discussion Why Regroup Handout Why Regroup?
Classroom Discussion Guide
Name:
Date:
"Regrouping is like a magic trick with numbers. Let's talk about why we need it and how it helps us solve bigger problems!"
1
Imagine you have 15 single candies. Can you put all 15 candies into a box that only holds 9 candies? Why or why not?
2
When we add 7 + 5 and get 12, why can't we just write "12" in the ones column? What do we do instead?
3
Think about subtracting 3 from 1. Can you do it? Why not? What magic trick do we use to help us?
4
How does using Base Ten Blocks help you understand regrouping better?
5
Can you think of a real-life situation where you might need to regroup something? (Hint: Think about money!)
Regrouping Game Trade & Solve Handout Trade & Solve
The Regrouping Game
Players: 2-4
Objective
Practice regrouping in a fun, interactive way! Be the player with the highest sum or difference.
Materials
Base Ten Blocks, Two Dice, Paper and Pencil.
How to Play
Addition Version
**Roll 1:** Create Number 1 (e.g., Roll 3 & 5 = 35).
**Roll 2:** Create Number 2 (e.g., Roll 2 & 8 = 28).
**Build It:** Build both numbers with blocks.
**Trade:** If you have 10+ ones, trade for a ten!
**Solve:** Count your total blocks and record.
-
Subtraction Version
**Roll 1:** Create a starting number.
**Roll 2:** Create a smaller number to subtract.
**Build It:** Build the starting number with blocks.
**Trade:** If you need more ones, trade 1 ten!
**Subtract:** Take away and find the difference.
Score Card
Round Problem Final Score Round 1 Round 2 Round 3 Round 4 Round 5
Highest Total Score Wins!
Regrouping Worksheet Show Your Work Show Your Work!
Regrouping Practice Worksheet
Name:
Date:
Instructions
Solve the addition and subtraction problems. Remember to show your regrouping! You can use your Base Ten Blocks if you need help.
Section A
Addition with Regrouping
1
__
45
+ 27
2
__
38
+ 16
3
__
59
+ 23
4
__
61
+ 19
5
__
24
+ 37
Section B
Subtraction with Regrouping
1
__ __
52
- 18
2
__ __
73
- 25
3
__ __
40
- 16
4
__ __
81
- 34
5
__ __
65
- 29
Boss Level Challenge!
Sarah had 34 stickers. Her friend gave her 18 more. Then, she gave 12 stickers to her brother. How many stickers does Sarah have now?
Show Your Work Area
Regrouping Quiz Quick Check Regrouping Quiz
Knowledge Check • Mastery Path
Name:
Date:
01
Solve: 34 + 19 = ?
__
34
+ 19
02
Solve: 26 + 48 = ?
__
26
+ 48
03
Solve: 51 - 23 = ?
____
51
- 23
04
Solve: 60 - 35 = ?
____
60
- 35
05
When you have 14 ones, what is the correct way to regroup them?
1 ten and 4 ones
4 tens and 1 one
14 tens
No regrouping needed
06
Explain in your own words why we need to regroup when subtracting 7 from 2 in a problem like 32 - 17.
Regrouping Quiz Quick Check Summative Assessment
Regrouping Mastery
Student:
Date:
Section 1: Addition Mastery
#1
__
28
+ 35
#2
__
46
+ 17
#3
__
59
+ 23
#4
__
77
+ 14
#5
__
32
+ 58
Section 2: Subtraction Mastery
#6
____
90
- 45
#7
____
64
- 27
#8
____
83
- 19
#9
____
50
- 26
#10
____
41
- 18
Section 3: Story Math
11. Maria had 25 balloons. Her friend gave her 17 more. How many balloons does Maria have now?
Workspace
Answer:
12. There were 43 birds in a tree. 16 birds flew away. How many birds are left in the tree?
Workspace
Answer:
Challenge: Deep Thinking
13. If you have 3 tens and 14 ones, and you regroup, what number do you have? Explain how you regrouped.
Regrouping Answer Key Master Resource Master Answer Key
Teacher Resource • Regrouping Rulz!
TEACHER ONLY
Warm Up: How Many?
Q1
2 Tens, 5 Ones = 25
Q2
2 Tens, 2 Ones = 22
Regrouped 12 ones.
Q3
3 Tens, 0 Ones = 30
Worksheet: Addition & Subtraction
Section A (Addition)
1. 45 + 27 = 72
2. 38 + 16 = 54
3. 59 + 23 = 82
4. 61 + 19 = 80
5. 24 + 37 = 61
Section B (Subtraction)
1. 52 - 18 = 34
2. 73 - 25 = 48
3. 40 - 16 = 24
4. 81 - 34 = 47
5. 65 - 29 = 36
Challenge Question
Step 1: 34 + 18 = 52. Step 2: 52 - 12 = 40 Stickers.
Quiz & Test Solutions
Quiz Key
1. 34 + 19 = 53
2. 26 + 48 = 74
3. 51 - 23 = 28
4. 60 - 35 = 25
5. Correct Choice: 1 Ten and 4 Ones
6. Explanation: 2 is smaller than 7, so you must borrow 10 ones from the 3 tens.
Test Key (Calculation)
1. 63
6. 45
2. 63
7. 37
3. 82
8. 64
4. 91
9. 24
5. 90
10. 23
11. Maria Answer: 42 Balloons
12. Birds Answer: 27 Birds
13. Challenge: 14 ones = 1 ten + 4 ones. 3 tens + 1 ten = 4 tens. Total = 44.
Verify vertical work to ensure carrying and borrowing notations are correct!
Regrouping Cool Down One Big Idea One Big Idea
Cool Down • Exit Ticket
Name:
Reflection Question
"In your own words, write down one big idea or one important thing you learned about regrouping today."
Bonus Thinking
"What is one question you still have about regrouping?"
You are a math rockstar
