Vertical addition to 20, with regrouping
- Age
- Ages 6–7
Addition with regrouping worksheets
For 28 + 17, add the ones: 8 + 7 = 15. Write 5 ones and exchange the other 10 for one ten.
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Try an example
For 28 + 17, add the ones: 8 + 7 = 15. Write 5 ones and exchange the other 10 for one ten. The tens now give 2 + 1 + 1 = 4, so the answer is 45.
What to check
Record the exchanged ten in the tens column so you do not forget it. Check by decomposing: 20 + 10 + 8 + 7 = 45. The carried digit represents an amount, not just a mark to copy.
Explain and check
Work through one example aloud before independent practice. To check 18 + 7 = 25, calculate 25 − 7. If a word problem asks about meters or coins, include that unit and check whether the answer fits the situation.