Write 1 addition problems. Each addend must be three digits. Write and solve a problem where you need to regroup to make a ten or a hundred. Explain why you needed to regroup.
Problem: 456 + 279
456
+279
-----
735
In this problem, when adding the ones column (6 + 9), we get 15 which is greater than 10. To accurately represent this in our answer, we regroup by carrying over the 1 to the tens column. This allows us to correctly add the tens column without any errors.