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    Addition with Regrouping Calculator

    Column addition step by step, with every carry

    Addition with Regrouping Calculator

    First addend
    Second addend

    Addition with Regrouping: How It Works

    How it works: 348 + 256 in a column

    348 + 256 in a column. Carries are the small circled digits above the columns.
    1carry1carry
    3 4 8
    +256
    604

    With regrouping: 2 carries — into the tens and the hundreds

    Write the numbers ones under ones, tens under tens. Add from right to left; when a column makes 10 or more, write its ones and carry 1 to the next column.
    348 + 256 = 604 →

    Practice examples with answers

    Solve it on paper, then open the example: the page shows the answer and the whole column.

    2-digit, no regrouping

    12 + 1247 + 1285 + 1241 + 1754 + 2341 + 2852 + 3652 + 47

    2-digit, with regrouping

    19 + 1228 + 1928 + 2841 + 3971 + 4763 + 6394 + 7189 + 11

    3-digit numbers

    105 + 105354 + 136256 + 187307 + 239536 + 291376 + 376564 + 485578 + 422

    Multi-digit (grade 4)

    1,234 + 1,2344,805 + 2,4688,042 + 3,579123,456 + 4,80512,345 + 6,71312,345 + 8,042123,456 + 23,456987,654 + 987,654

    Common mistakes

    • Forgetting the carry: 348 + 256 then comes out as 594 instead of 604 — the 1 from 8 + 6 = 14 never reaches the tens.
    • Lining the numbers up on the left: 453 + 89 then turns into 453 + 890 = 1,343 instead of 542. Ones go under ones.
    • Writing the whole column sum: 8 + 6 = 14 is written as 4 with 1 carried, not as 14 under the ones.

    See Also

    Last Results

    FAQ

    How does addition with regrouping work?

    Write the numbers right-aligned, ones under ones. Add each column from right to left. When a column adds up to 10 or more, write its ones digit and carry 1 to the next column on the left, where it is added along with the digits there.

    What does carrying the 1 mean?

    It moves a ten into the next column. In 8 + 6 = 14 the 4 stays in the ones and the 1 — one ten — is written above the tens and added there: that is why 348 + 256 has a 0 in the tens of 604.

    How do you check column addition?

    Subtract one addend from the sum. If 348 + 256 = 604, then 604 − 256 must give 348. Every result page links that subtraction, worked in a column.

    Can this calculator add decimals?

    No, it adds whole numbers only. For decimals, line up the decimal points instead of the last digits and add the same way, carrying across the point.