Addition Regrouping Worksheet
Day 1 Tutorial 3-Digit Addition
Addition Regrouping Challenge
Name:
Date: Score:
Core Strategy
3-Step Place Value Regrouping
Step 1: Ones (O)
Add ones column. If sum is 10 or more, carry tens to regroup box.
8 + 7 = 15 → 1 Ten, 5 Ones
Step 2: Tens (T)
Add carried ten + existing tens. Regroup into hundreds if sum ≥ 10.
1 + 6 + 5 = 12 → 1 H, 2 T
Step 3: Hundreds (H)
Add carried hundred + existing hundreds. Write total sum.
1 + 3 + 2 = 6 Hundreds
Model Example
[1][1]
3 6 8
+ 2 5 7
6 2 5
A Guided Practice: Place-Value Grids (Single & Double Regrouping)
Write regrouped digits in the top carry boxes!
#1 H T O
2 4 8
#2 H T O
4 7 3
#3 H T O
5 6 9
#4 H T O
6 9 7
B Independent Fluency Practice
Calculate accurately. Remember to add carried numbers!
#5
_ _
3 2 9
+ 4 5 7
#6
_ _
4 8 3
+ 2 6 2
#7
_ _
6 1 5
+ 2 9 8
#8
_ _
5 7 6
+ 3 4 8
#9
_ _
7 4 9
+ 1 8 4
#10
_ _
2 9 8
+ 6 3 5
Tip: Always double check your carry boxes before writing final digits. Page 1 of 2
Day 1 Tutorial • Part 2
Real-World Word Problems & Applications
Target: 3-Digit Master
C Word Problems: Show Your Vertical Setup & Regrouping
Line up hundreds, tens, and ones neatly!
#11 School Book Fair Charity Drive
Oakridge Elementary collected 386 books on Monday and 279 books on Tuesday for their charity drive. How many books did the school collect in total across both days?
Final Answer Statement:
The school collected
books in total.
Vertical Setup & Carry Boxes
_ _ _
#12 Wildlife Sanctuary Migration Count
A bird sanctuary recorded 468 migratory geese arriving in the morning and 385 geese arriving in the afternoon. What was the total number of geese recorded that day?
Final Answer Statement:
A total of
geese were recorded.
Vertical Setup & Carry Boxes
_ _ _
#13 Community Food Pantry Donation Drive
Volunteers organized donations for the weekend distribution. They packed 574 cans of vegetables and 288 boxes of pasta . How many food items were packed altogether?
Final Answer Statement:
The volunteers packed
food items in total.
Vertical Setup & Carry Boxes
_ _ _
Self-Assessment Checklist:
I lined up digits by place value I carried into tens and hundreds I checked my additions
Page 2 of 2
Addition Regrouping Answer Key ✓
Teacher Reference • Day 1 Full Solutions & Step Annotations
Addition Regrouping Answer Key
Master Answer Key
Key Teaching Diagnostic Points Scoring: 1 pt per correct carry + 1 pt per correct sum
Watch for "Forgot to Add 1" Students correctly write carry digit but forget to add it to the column total.
Watch for "Reversed Digits" Writing 1 in the answer space and carrying the ones digit (e.g., carrying 5 from 15).
Double Regrouping Check Ensure regrouping into hundreds is clearly recorded above the H column.
✓ Section A Solutions: Place-Value Grids
Carried digits shown in green boxes
#1 H T O
-
1
2 4 8
3 8 3
#2 H T O
1
-
4 7 3
7 2 7
#3 H T O
1
1
5 6 9
8 5 3
#4 H T O
1
1
6 9 7
8 8 3
✓ Section B Solutions: Fluency Set
All regroupings noted with superscript additions
#5
1
3 2 9
+ 4 5 7
7 8 6
#6
1
4 8 3
+ 2 6 2
7 4 5
#7
1 1
6 1 5
+ 2 9 8
9 1 3
#8
1 1
5 7 6
+ 3 4 8
9 2 4
#9
1 1
7 4 9
+ 1 8 4
9 3 3
#10
1 1
2 9 8
+ 6 3 5
9 3 3
Teacher Reference: Addition Regrouping Practice Page 1 of 2
Teacher Reference • Day 1
Part 2 Answer Key & Scoring Rubric
Solutions Guide
✓ Section C: Word Problems Solutions & Step Details
2 Points Each (1 pt setup + 1 pt final statement)
#11 School Book Fair Solution 2 Points
Calculation: \(386 + 279 = 665\)
Subtraction Borrowing Worksheet −
Day 2 Tutorial 3-Digit Subtraction
Subtraction Unbundling Challenge
Name:
Date: Score:
Golden Rhyme More on the floor? Go next door and take 10 more!
Unbundle & Trade
1. Check Ones
Can we subtract the bottom digit? If bottom is larger, borrow 1 ten.
Trade 1 Ten → 10 Ones
2. Subtract Ones
Cross out neighbor digit, reduce by 1. Add 10 to current digit, then subtract.
4 becomes 14 − 7 = 7
3. Repeat for Tens
If tens digit is too small, unbundle 1 hundred into 10 tens. Subtract tens, then hundreds.
1 becomes 11 − 8 = 3
Model Example
[5][11][14]
6 2 4
− 3 8 7
2 3 7
A Guided Practice: Place-Value Unbundling Grids
Cross out and write new values in top boxes!
#1 H T O
5 4 2
− 2 1 7
#2 H T O
6 3 5
− 2 8 1
#3 H T O
7 4 3
− 3 6 8
#4 H T O
8 2 5
− 4 5 9
B Independent Fluency Practice
Cross out digits cleanly before subtracting!
#5
_ _ _
6 5 1
− 2 3 8
#6
_ _ _
5 2 7
− 1 8 4
#7
_ _ _
8 1 4
− 3 5 6
#8
_ _ _
7 3 2
− 4 7 8
#9
_ _ _
6 4 5
− 2 8 9
#10
_ _ _
9 2 3
− 5 4 7
Pro-Tip: If the top number is equal to bottom number, the answer is 0. No borrowing needed! Page 1 of 2
Day 2 Tutorial • Part 2
Borrowing Across Zeros & Applications
Target: Subtraction Master
The Zero Zone Rule When next door has a 0 , go to the Hundreds ! Borrow 1 H → 10 Tens. Then borrow 1 Ten → 9 Tens and 10 Ones.
[4][9][10]
C The Zero Zone: Regrouping Across Zeros
Carefully track the middle 0 turning into 9!
#11
5 0 4
− 2 3 8
#12
7 0 0
Subtraction Borrowing Answer Key ✓
Teacher Reference • Day 2 Full Solutions & Unbundling Annotations
Subtraction Borrowing Answer Key
Master Answer Key
Common Subtraction Errors to Target Scoring: 1 pt per correct unbundle + 1 pt per correct difference
"Smaller from Larger" Trap Subtracting top from bottom (e.g. \(2 - 7\) written as 5). Reiterate: top number is what you have!
Forget to Decrement Adding 10 to current place without crossing off and reducing neighbor digit by 1.
Double Regrouping Chain Track two consecutive unbundlings where tens place gets reduced twice (borrowed then loaned).
✓ Section A Solutions: Place-Value Grids
Unbundled values shown in green boxes
#1 H T O
-
3
12
5 4 2
− 2 1 7
3 2 5
#2 H T O
5
13
-
6 3 5
− 2 8 1
3 5 4
#3 H T O
6
13
13
7 4 3
− 3 6 8
3 7 5
#4 H T O
7
11
15
8 2 5
− 4 5 9
3 6 6
✓ Section B Solutions: Fluency Set
Unbundled values noted above digits
#5
4 11
6 5 1
− 2 3 8
4 1 3
#6
4 12
5 2 7
− 1 8 4
3 4 3
#7
7 10 14
8 1 4
− 3 5 6
4 5 8
#8
6 12 12
7 3 2
− 4 7 8
2 5 4
#9
5 13 15
6 4 5
− 2 8 9
3 5 6
#10
8 11 13
9 2 3
− 5 4 7
3 7 6
Teacher Reference: Subtraction Borrowing Practice Page 1 of 2
Teacher Reference • Day 2
Part 2 Answer Key & Inverse Checks
Solutions Guide
✓ Section C: The Zero Zone Solutions
#11 (504 − 238)
4
9
14
5 0 4
