Three-Digit Addition Packet
Day 1
Three-Digit Addition
Focus: Regrouping in the Tens Place vs. No Regrouping
Name:
Date:
How-To Model: Adding Tens with Regrouping US Standard Algorithm
Step 1: Ones
Add ones first.
4 + 3 = 7 (under 10, no regrouping!)
Step 2: Tens
Add tens.
8 + 7 = 15. Write 5 in tens, carry 1 hundred!
Step 3: Hundreds
Add hundreds + carry.
1 + 2 + 1 = 4.
Total: 457
H T O
1
2 8 4
4 5 7
1
Regroup Tens? Yes No
H T O
3 2 4
2
Regroup Tens? Yes No
H T O
4 8 3
3
Regroup Tens? Yes No
H T O
5 1 6
4
Regroup Tens? Yes No
H T O
1 9 2
5
Regroup Tens? Yes No
H T O
3 7 5
6
Regroup Tens? Yes No
H T O
6 3 1
Remember: 10 tens = 1 hundred. If the tens sum is 10 or more, carry 1 to the Hundreds box! Page 1 • Day 1
Day 2
Three-Digit Addition
Check the Tens: Do they equal 10 or more?
Name:
Date:
! Look-Ahead Clue: Look at the tens digits before adding. If their sum is 10 or greater, write 1 in the dashed hundreds box!
6 Problems
1
Regroup Tens? Yes No
H T O
2 8 5
2
Regroup Tens? Yes No
H T O
4 3 1
3
Regroup Tens? Yes No
H T O
5 6 4
4
Regroup Tens? Yes No
H T O
2 0 5
5
Regroup Tens? Yes No
H T O
7 2 3
6
Regroup Tens? Yes No
H T O
3 9 1
Self-Check: Did you add the regrouped 1 hundred when adding the hundreds column? Page 2 • Day 2
Day 3
Three-Digit Addition
Midweek Checkpoint: Spot the Regrouping
Name:
Date:
Detective Goal: Find which 3 problems need regrouping in the tens place and which 3 do not!
Midweek Check
1
Regroup Tens? Yes No
H T O
3 5 2
2
Regroup Tens? Yes No
H T O
2 7 4
3
Regroup Tens? Yes No
H T O
4 6 3
4
Regroup Tens? Yes No
H T O
6 1 7
5
Regroup Tens? Yes No
H T O
1 8 2
6
Regroup Tens? Yes No
H T O
5 2 4
Math Talk: Which problem had the greatest tens sum? Problem #
Page 3 • Day 3
Day 4
Three-Digit Addition
Power Practice: Speed and Accuracy
Name:
Date:
Power Tip: Write your numbers clearly in each box. Always add down: Top + Bottom + Carried 1!
Keep Going
1
Regroup Tens? Yes No
H T O
3 9 4
2
Regroup Tens? Yes No
H T O
5 4 1
3
Regroup Tens? Yes No
H T O
2 1 6
4
Regroup Tens? Yes No
H T O
4 8 5
5
Regroup Tens? Yes No
H T O
6 5 3
6
Regroup Tens? Yes No
H T O
7 3 2
Concept Check: In Problem 1, 9 tens + 6 tens = 15 tens (1 hundred + 5 tens). True False
Page 4 • Day 4
Day 5
Three-Digit Addition
Mastery Challenge: Show What You Know!
Name:
Date:
Final Day Goal: Solve all 6 problems using the US Algorithm. Take your time and check your tens!
Mastery Badge
1
Regroup Tens? Yes No
H T O
4 2 3
2
Regroup Tens? Yes No
H T O
3 7 1
3
Regroup Tens? Yes No
H T O
2 9 5
4
Regroup Tens? Yes No
H T O
6 1 4
5
Regroup Tens? Yes No
H T O
5 8 2
6
Regroup Tens? Yes No
H T O
3 4 1
How do you feel about 3-digit addition?
Needs Practice Getting Good Addition Master! 🌟
Page 5 • Day 5
