Ten Ridge Slides Unit 1: Nearest 10
| Rounding Ridge
Level 1
Climbing Ten Ridge
Discovering rounding to the nearest ten using base-ten visual blocks and the magical Ten Ridge hill.
Goal: Will round multi-digit numbers to the nearest 10 Slide 1 of 5
Base-Ten Closeness: Which is Closer?
Let's look at the physical distance to our "Friendly Tens"
Friendly Tens: 30 & 40
Start Bench: 30
Exactly 30
Our Target
Our Number: 34
Only 4 away from 30!
But 6 away from 40.
End Bench: 40
Exactly 40
Takeaway: 34 is physically closer to 30. So, we round down to 30!
Slide 2 of 5
The Climbing Ten Ridge Hill
Where does the ball roll? Visualizing the tipping point.
Midpoint Peak: 5
30
Rolls Left (Down)
31 32 33 34
35
Peak: Rolls Right!
36 37 38 39
40
Rolls Right (Up)
Under the Peak (1, 2, 3, 4)
These numbers roll back down to the starting bench. Round DOWN !
At & Past the Peak (5, 6, 7, 8, 9)
Once you touch the peak (5), the ball slides forward to the end bench. Round UP !
Rule: If the ones digit is 5 or more , round up! If it is 4 or less , round down! Slide 3 of 5
Reducing Load: Color-Coded Place Value
Color helps us know exactly which digit to look at and which to change!
Example: Round 247 to the nearest 10
Hundreds
Tens (Target) (Underline & Focus)
Ones (Neighbor) (The Decision Maker)
2
4
7
Stays the same because we round the tens!
Will it stay 4 or go up to 5?
Since 7 is 5 or more, it rolls up!
Final Decision: 247 250
Color Rule: Green/Teal is Target. Yellow/Amber is Neighbor! Slide 4 of 5
Ten Ridge Challenges
Let's solve these together before your independent worksheet!
CHALLENGE A Nearest 10
Round 58
1. What are the benchmark tens? 50 and 60
2. Is the ones digit (8) 5 or more? YES!
Rolls up to 60!
CHALLENGE B Nearest 10
Round 142
1. What are the benchmark tens? 140 and 150
2. Is the ones digit (2) 5 or more? NO! (Rolls down)
Rolls down to 140!
Are we ready to climb higher? Next is your worksheet challenge! Slide 5 of 5
Ten Ridge Practice Worksheet Climbing Ten Ridge Practice
Lesson 1: Nearest 10
Student Name:
Date:
1 Part 1: Base-Ten Block Closeness (Which Ten is Closer?)
Look at the base-ten models. Decide which "friendly ten" (ending in 0) is closer to the target number. Circle your choice.
Target: 23 Tens: 2, Ones: 3
Is 23 closer to:
20 or 30
Target: 37 Tens: 3, Ones: 7
Is 37 closer to:
30 or 40
2 Part 2: Climbing Ten Ridge (Midpoint Hills)
Write the numbers on the hill slopes. Place your target number. If it hits 5 or higher, it rolls forward! If not, it rolls backward.
3. Round 64 to the nearest 10.
60
Mid: 65
64 70
Since 4 is less than 5, we round down to:
_____
4. Round 18 to the nearest 10.
10
Mid: 15
18 20
Since 8 is 5 or more, we round up to:
_____
Unit: Rounding Ridge — Lesson 1 Practice Page 1 of 2
Independent Ten Ridge Climbing
Level 1: Nearest 10 Goal Check
3 Part 3: Place Value Decision Board
Below, the Target Tens digit is underlined in green and the Ones Neighbor digit is highlighted in orange. Write down the decisions to round each number.
Original Number
Neighbor Value
Roll Up or Down?
Rounded to Nearest 10
52
Neighbor is 2
Rolls Down (4 or less)
50
87
Neighbor is 7
Rolls ______ (5 or more)
164
Neighbor is 4
Rolls ______ (4 or less)
345
Neighbor is 5
Rolls ______ (5 or more)
908
Neighbor is 8
Rolls ______ (5 or more)
4 Part 4: Quick-Climb Challenge (Independent Rounding)
Underline the tens digit, check your ones neighbor, and round to the nearest 10 independently.
#1
62
#2
45
#3
119
#4
283
#5
796
How high did you climb?
Rate your understanding of rounding to the nearest 10.
Baseline (Needs Help)
Mid-Slope (Getting There)
The Peak (I Got It!)
Hundred Hill Slides Unit 2: Nearest 100
| Rounding Ridge
Level 2
Scaling Hundred Hill
Stepping up to hundreds! Mastering how to round using physical block sizes, color-coded place value grids, and the 50-midpoint hill.
Goal: Will round multi-digit numbers to the nearest 100 Slide 1 of 5
Hundred Blocks: Seeing the Scale
Let's look at the size of our blocks. Which hundred-bench are we closer to?
Benches: 200 & 300
Starting Hundred: 200
Exactly 200
Our Target
Our Number: 230
Only 30 away from 200!
But 70 away from 300.
Ending Hundred: 300
Exactly 300
Takeaway: 230 is physically closer to 200. So, we round down to 200!
Slide 2 of 5
Scaling the Hundred Hill
For hundreds, we count by tens! Where is the tipping point?
Midpoint Peak: 50
700
Rolls Down
710 720 730 740
750
Midpoint Peak: Rolls Up!
760 770 780 790
800
Rolls Up
Rule for Hundreds: Underline the Hundreds Digit. Check the Tens Digit neighbor!
If the Tens Neighbor is 5, 6, 7, 8, or 9, round UP! If it is 4, 3, 2, 1, or 0, round DOWN!
We ignore the ones digit entirely when rounding to the nearest 100! Slide 3 of 5
Place Value Color-Coding for 100s
Highlighting target and neighbor digits in matching colors to reduce memory load.
Example: Round 1,382 to the nearest 100
Thousands
Hundreds (Target) (Underline & Focus)
Tens (Neighbor) (The Decision Maker)
Ones (Turns to Zero)
1
3
8
2
Stays the same!
Will 3 stay 300 or go up to 400?
Since 8 is 5 or more, we round UP!
Becomes zero!
Final Decision: 1,382 1,400
Remember: Neighbor is the digit immediately to the right of the target! Slide 4 of 5
Hundred Hill Challenges
Let's solve these together with our new scaling strategy!
CHALLENGE A Nearest 100
Round 437
1. Target hundreds: 400 or 500?
2. Neighbor tens digit is 3
Rolls down to 400!
CHALLENGE B Nearest 100
Round 2,651
Hundred Hill Practice Worksheet Scaling Hundred Hill Practice
Lesson 2: Nearest 100
Student Name:
Date:
1 Part 1: Hundred-Block Scaling (Physical Proximity)
Compare the size of hundred flats. Circle the "friendly hundred" that is physically closer to our target number.
Target: 120 Hundreds: 1, Tens: 2, Ones: 0
Is 120 closer to:
100 or 200
Target: 280 Hundreds: 2, Tens: 8, Ones: 0
Is 280 closer to:
200 or 300
2 Part 2: Scaling Hundred Hill (Midpoint 50)
Trace your number's path on the hill. If the neighbor tens digit is 50 or higher, scale up! If it is 40 or lower, roll back down.
3. Round 450 to the nearest 100.
400
Mid: 450
450 500
Since neighbor is exactly 50 (at the peak), we round up to:
_____
4. Round 814 to the nearest 100.
800
Mid: 850
814 900
Since neighbor tens is 1 (4 or less), we round down to:
_____
Unit: Rounding Ridge — Lesson 2 Practice Page 1 of 2
Independent Hundred Hill Scaling
Level 2: Nearest 100 Goal Check
3 Part 3: Place Value Decision Board (100s)
Below, the Target Hundreds digit is underlined in sky blue and the Tens Neighbor digit is highlighted in orange. Write down your steps and round!
Original Number
Neighbor Value
Roll Up or Down?
Rounded to Nearest 100
345
Neighbor is 4
Rolls Down (4 or less)
300
781
Neighbor is 8
Rolls ______ (5 or more)
1,230
Neighbor is 3
Rolls ______ (4 or less)
5,694
Neighbor is 9
Rolls ______ (5 or more)
9,052
Neighbor is 5
Rolls ______ (5 or more)
4 Part 4: Quick-Climb Challenge (Independent Rounding to 100)
Underline the hundreds digit, look at your tens neighbor, and round to the nearest 100 independently.
#1
138
#2
649
#3
1,573
#4
3,425
#5
8,950
How steady is your footing?
Rate your confidence scaling up to hundreds rounding.
Needs Help
Thousand Mountain Slides Unit 3: Nearest 1000
| Rounding Ridge
Level 3
Conquering Thousand Mountain
The ultimate climb! Rounding to the nearest thousand using physical block scales, 500-midpoint peaks, and complete 10/100/1000 mixed mastery.
Goal: Will round multi-digit numbers to 10, 100, and 1000 independently Slide 1 of 5
Thousand Cubes: Extreme Scaling
Let's look at the size of our blocks. Which thousand-bench are we closer to?
Benches: 3,000 & 4,000
Starting Thousand: 3,000
Exactly 3,000
Our Target
Our Number: 3,400
Only 400 away from 3,000!
But 600 away from 4,000.
Ending Thousand: 4,000
Exactly 4,000
Takeaway: 3,400 is physically closer to 3,000. So, we round down to 3,000!
Slide 2 of 5
Conquering Thousand Mountain
For thousands, we count by hundreds! Where is the tipping point?
Midpoint Peak: 500
8,000
Rolls Down
8,100 8,200 8,300 8,400
8,500
Midpoint Peak: Rolls Up!
8,600 8,700 8,800 8,900
9,000
Rolls Up
Rule for Thousands: Underline the Thousands Digit. Check the Hundreds Digit neighbor!
If the Hundreds Neighbor is 5, 6, 7, 8, or 9, round UP! If it is 4, 3, 2, 1, or 0, round DOWN!
We ignore the tens and ones digits completely when rounding to the nearest 1000! Slide 3 of 5
Place Value Color-Coding for 1,000s
Target is thousands, neighbor is hundreds. Color guides our eyes.
Example: Round 6,725 to the nearest 1000
Thousands (Target) (Underline & Focus)
Hundreds (Neighbor) (The Decision Maker)
Tens (Turns to Zero)
Ones (Turns to Zero)
6
7
2
5
Will 6 stay 6,000 or go up to 7,000?
Since 7 is 5 or more, we round UP!
Becomes zero!
Becomes zero!
Final Decision: 6,725 7,000
Whenever we round to a place value, all columns to its right become zeros! Slide 4 of 5
The Ultimate Mixed Peak Challenge
Can you round the same number to different places? Let's check!
OUR Base Number
3,528
We will use our target and neighbor strategy for all 3!
Rounding Ridge Anchor Chart Rounding Ridge Desk Guide
My Peak Rounding Anchor Chart
A visual map to round any multi-digit number to the nearest 10, 100, and 1,000
Visual Support 1: The Rounding Ridge Hills
Find the neighbor digit. Place it on the slope. Where does the ball roll?
Nearest 10 Hill
L: 0 Peak: 5 R: 10
Roll down: 1, 2, 3, 4
Nearest 100 Hill
L: 00 Peak: 50 R: 100
Roll down: 10 to 40
Nearest 1000 Mountain
L: 000 Peak: 500 R: 1000
Roll down: 100 to 400
Visual Support 2: Color-Coded Place Value Charts
Use the colors to guide your eyes! The Target is underlined, and the Neighbor makes the rule.
NEAREST 10
Hundreds Tens (Target) Ones (Neighbor)
Example: 347 → 350
NEAREST 100
Thousands Hundreds (Target) Tens (Neighbor) Ones
Example: 1,284 → 1,300
NEAREST 1000
Thousands (Target) Hundreds (Neighbor) Tens Ones
Example: 4,512 → 5,000
Visual Support 3: Base-Ten Block Sizes
Use physical block sizes to understand distance closeness.
Ones Block
Single unit value: 1
Tens Rod
Holds 10 ones units
Hundreds Flat
Holds 100 ones units
My 4-Step Rounding Method
Find and underline the Target Place Value.
Circle the Neighbor digit to its immediate right.
Decide: Is Neighbor 5 or more? (Go Up!)
Convert all digits to the right into Zeros (0)!
Neighbor Rule Summary:
4, 3, 2, 1, 0
Round DOWN
5, 6, 7, 8, 9
Round UP
IEP Support Kit Keep on your desk as a reminder!
Rounding Ridge Assessment Rounding Ridge Evaluation
Unit Peak Assessment
Student Name:
Date:
Assessment Instructions:
Let's warm up on Page 1! Take a look at these review questions with the anchor guides. Then, on Page 2, complete the three independent challenges. Try your best to conquer all the hills!
1 Part 1: The Three Mountain Slopes (Warm-Up Review)
A. Round 57 to the nearest 10.
Find the neighbor ones digit (7). It is 5 or more, which rolls up to the ending ten:
B. Round 642 to the nearest 100.
Find the neighbor tens digit (4). It is 4 or less, which rolls down to the starting hundred:
C. Round 2,851 to the nearest 1,000.
Find the neighbor hundreds digit (8). It is 5 or more, which rolls up to the ending thousand:
Unit: Rounding Ridge — Peak Assessment Warm-up Page 1 of 2
Independent Rounding Peak Assessment
IEP Mastery Goal Evaluation
Part A: Round to the Nearest 10 Target Ones → Decides Tens
#1
43
#2
86
#3
152
#4
375
#5
904
Part B: Round to the Nearest 100 Target Tens → Decides Hundreds
#6
219
#7
578
#8
1,340
#9
4,851
#10
6,094
Part C: Round to the Nearest 1,000 Target Hundreds → Decides Thousands
#11
2,384
#12
7,612
#13
5,500
#14
14,195
#15
82,900
IEP Annual Review Goal Progress Tracker (Teacher Evaluation Only)
Nearest 10 Accuracy
_____ / 5 Correct
Goal Met? (4/5 is 80%) [ ] Yes [ ] No
Nearest 100 Accuracy
_____ / 5 Correct
Goal Met? (4/5 is 80%) [ ] Yes [ ] No
Nearest 1000 Accuracy
_____ / 5 Correct
Goal Met? (4/5 is 80%) [ ] Yes [ ] No
IEP Mastery: 80% accuracy in 4 out of 5 independent attempts Page 2 of 2
Rounding Ridge Teacher Guide Rounding Ridge Teacher Guide
Teacher-Facing Companion
Direct instruction guidelines, prompt scripts, and professional IEP progress tracking logs.
Intervention Pacing & Instructional Prompts
Lesson 1: Nearest 10
Introduce physical spacing using Base-Ten Blocks on Slide 2. Scaffold by drawing balls rolling down the Ten Ridge Hill (Slide 3) where the midpoint 5 is the turning point. Highlight that ones of 5-9 always push up.
Lesson 2: Nearest 100
Transition to hundred flats. The midpoint shifts to 50 on Slide 3. Use color-coded charts (Slide 4) to focus attention exclusively on target Hundreds and the neighbor Tens column.
Lesson 3: Nearest 1,000
Scale to the thousand-block cube. Midpoint is 500 . Conduct mixed board practice (Slide 5) before evaluating students using the final assessment. Maintain desk anchor charts for scaffolding.
IEP Annual Goal Progress Tracking Matrix
Goal: Round 10, 100, 1000 independently (80% / 4 of 5 times)
Student Name
Date
Nearest 10 (Score/5)
Nearest 100 (Score/5)
Nearest 1000 (Score/5)
Goal Met? (80%)
/ 5
/ 5
/ 5
[ ] Yes [ ] No
/ 5
/ 5
/ 5
[ ] Yes [ ] No
/ 5
/ 5
/ 5
[ ] Yes [ ] No
/ 5
/ 5
/ 5
[ ] Yes [ ] No
Intervention Prompt Scripts (Verbal Check Questions)
When student hesitates: "Underline the place value place we want. Good. Now put your finger on its neighbor to the right. Is that neighbor number 5 or bigger? If yes, it climbs to the next benchmark. If no, it slips backward!"
To correct common misconception (e.g., rounding the hundreds place instead of tens): "Look at the color chart. When rounding to the nearest ten, only the ones neighbor determines the rule. The hundreds digit doesn't change!"
Rounding Ridge Intervention Unit — Pacing & Tracking Page 1 of 2
Master Answer Keys
Rounding Ridge Evaluation Tools
Lesson 1 Worksheet Answer Key
Part 1: 23 is closer to 20 | 37 is closer to 40 Part 2: 3. 64 rounds to
