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3 Digit Addition With Regrouping For Kids

David Campbell Printable

3 digit addition with regrouping becomes much easier when you line up each number by place value and work from right to left. The key idea is simple: add the ones first, then the tens, then the hundreds. When a column makes 10 or more, you regroup by carrying to the next place. Clear setup and careful carrying help you find the correct sum every time.

A worksheet with three-digit column addition problems, including regrouping exercises and missing-digit sums to complete.

source: Cazoom Maths

Set Up the Columns

A 3-digit addition worksheet with 12 vertical problems, each using blank regrouping boxes above the numbers and a line for the answer.

source: Superstar Worksheets

Start by writing the numbers vertically so ones are under ones, tens under tens, and hundreds under hundreds. If the digits are not lined up, the answer can be wrong even before you begin adding. For example, in 348 + 276, write 8 under 6, 4 under 7, and 3 under 2. Then add each column from the right side first. This keeps place value organized and makes regrouping much easier to see.

A baking-themed worksheet titled “Baking Up Addition Problems” with 15 three-digit addition problems, including baking utensil illustrations and a name line.

source: Lucky Little Learners

A worksheet titled “3-Digit Addition With Regrouping” shows six addition problems arranged in hundreds, tens, and ones columns, with blank answer rows and regrouping boxes.

source: Shop – Lucky Little Learners

Regroup as You Add

Now add the ones column. If the total is 10 or more, write only the ones digit and carry the tens digit to the next column. For 348 + 276, 8 + 6 = 14, so write 4 in the ones place and carry 1 to the tens column. Then add the tens: 4 + 7 + 1 = 12, so write 2 and carry 1 to the hundreds column. Finally, add the hundreds: 3 + 2 + 1 = 6. The sum is 624.

A 3-digit addition worksheet with 16 numbered problems and spaces to set out the calculations; the first problem is shown vertically as 368 + 257.

source: Math Salamanders

A good quick check is to estimate first. Round 348 to 300 and 276 to 300, so the answer should be close to 600. Since 624 is near 600, it makes sense. You can also re-add by columns or check that each carried number was included once. This extra step helps catch mistakes like forgetting the carried digit or writing it in the wrong place.

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A worksheet titled “Adding Triple-Digit Numbers With Regrouping,” with 12 vertical addition problems and blank spaces for answers.

source: K12 Math Worksheets

When practicing, focus on neat setup and one column at a time. Read the problem carefully, align the digits, and keep your carries small and visible above the next column. If a column does not add to 10 or more, simply write the total in that place and move on. With a little repetition, 3 digit addition with regrouping becomes a steady routine rather than a tricky step.

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