Will problems carry into the hundreds?

Some will. The sheet mixes problems that regroup once with problems that regroup in both the ones and the tens.

Should my child estimate first?

It helps. Rounding both numbers to the nearest hundred gives a target, and a wrong carry usually misses it by a hundred.

3rd grade addition with regrouping

3rd grade addition with regrouping worksheets

Third graders add three-digit numbers where the ones, the tens, or both make ten or more. Every problem regroups at least once, so your child practises carrying into the tens and the hundreds instead of hoping the columns stay small.

Free printable PDF worksheet, aligned to Common Core 3.NBT.A.2.

Each print is a different sheet with its own answer key. You don't need to sign up.

The kind of problems you'll get

Solve each problem.

183 + 486 =
Answer: 669
109 + 449 =
Answer: 558
698 + 156 =
Answer: 854

Every print pulls a fresh set of problems at this level, so a make-up test or a second sibling never gets the same sheet.

What's on a 3rd grade sheet

The sample sheet above has 10 problems. Its answers run from 558 to 972. On the 2nd grade sample they run from 51 to 100. The 2nd grade sample has 12. This sheet is aligned to 3.NBT.A.2. The 2nd grade sheet is aligned to 2.NBT.B.5.

Addition with regrouping. Solve each problem. 10 problems per page.

Every version prints on US Letter or A4, with its answer key after the problems.

How to teach this

Ask which columns will regroup before adding: a quick look at the ones and tens digits tells you. Then add right to left, writing every carry. A double carry (ones into tens, tens into hundreds) is the one to watch; it is where a rushed child drops a 1.

Watch for: Kids write the whole 15 under the ones column. Only the 5 stays; the 1 moves up as a ten. Kids forget the carried 1 when the next column also adds up neatly. Touch the carry before adding the column.

Common questions about 3rd grade addition with regrouping

Will problems carry into the hundreds?: Some will. The sheet mixes problems that regroup once with problems that regroup in both the ones and the tens.
Should my child estimate first?: It helps. Rounding both numbers to the nearest hundred gives a target, and a wrong carry usually misses it by a hundred.

Related worksheets

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Aligned to Common Core 3.NBT.A.2. Reviewed by the One more sheet team. Content version 241, updated September 2026.

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