Decide: does this need regrouping? Write yes or no, then solve.
23 + 45: Regroup? ____
23 + 45 =
28 + 35: Regroup? ____
28 + 35 =
41 + 56: Regroup? ____
41 + 56 =
39 + 44: Regroup? ____
39 + 44 =
Add ones column first. Regroup if needed. Then tens.
28
+ 35
+ 14
47
+ 26
+ 19
One of these has a regrouping error. Find it, explain the error, and fix it.
28
+ 35
53
✓ or ✗?
Explain the error:
Correct answer:
58
+ 39
87
✓ or ✗?
Explain the error:
Correct answer:
Write it as a column problem, then solve.
47 + 58 =
47
+ 58
36 + 69 =
36
+ 69
Create Your Own
Make a column addition problem that needs regrouping. Write it and solve it.
+
Strategy I used: