Double Digit Addition with Regrouping
30 two-digit addition problems stacked in columns on three pages. Every problem carries from the ones to the tens, and every sum stays under 100. It's the classic regrouping sheet for 2nd graders once two-digit addition without regrouping is solid.
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Carrying from the ones
In 59 + 34, the ones make 13. Write the 3 under the line and put a small 1 on top of the tens column. Then the tens add up to 5 + 3 + 1 = 9, for 93.
The most common slip is forgetting the carried 1, which gives 83 here. Have students write it at the top of the tens column every time, before they add the tens. Problems where the ones make exactly 10, like 54 + 26, catch a lot of kids: write the 0, carry the 1, and the answer is 80. Writing 10 in the ones place gives 710.
If a student isn't sure when to carry, spend a day on double-digit addition without regrouping, or read the regrouping guide together.
Frequently Asked Questions
What is regrouping in addition?
When a column adds up to 10 or more, ten ones are traded for one ten, or ten tens for one hundred, and moved to the next column. Carrying is the older name for the same step.
Why do all the sums stay under 100?
So the sheet practices one thing: carrying from the ones to the tens. With every sum under 100, the tens never overflow. Carrying into the hundreds comes later, with three-digit numbers.
What grade learns double-digit addition with regrouping?
2nd grade, where students add within 100 using place value. By the end of the year they're expected to do it fluently.