Triple Digit Addition (Vertical)
30 addition problems with two three-digit numbers each, stacked in columns on three pages. Every problem regroups at least once, in the ones, the tens, or both, and every sum stays under 1,000. It's for 3rd graders and strong 2nd graders who are comfortable with two-digit regrouping.
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Regrouping in more than one place
With three columns, a problem can regroup in the ones, the tens, or both. In 558 + 146, both happen. The ones make 14: write 4, carry 1. The tens make 5 + 4 + 1 = 10: write 0, carry 1. The hundreds make 5 + 1 + 1 = 7, for 704.
A zero in the middle of the answer, like the 0 in 704, is where students most often slip. They see the tens make 10, write 10, and end up with a four-digit answer. Each column gets exactly one digit under the line.
Rounding makes a quick check. 558 + 146 is about 600 + 100, so an answer near 700 makes sense.
Frequently Asked Questions
What grade learns three-digit addition with regrouping?
2nd graders add within 1,000, and 3rd graders are expected to do it fluently. Every sum on this sheet stays under 1,000 to match.
Why does my student carry in every column?
Some students start carrying everywhere once they learn how. A column only regroups when it adds up to 10 or more, so have them say each column total out loud before writing anything.
What comes after this sheet?
Four-digit addition, where the same steps run across one more column and the sums can reach five digits.