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    Addition with Regrouping: 123,456 + 12,345

    Addition with Regrouping Calculator
    First addend
    Second addend

    What is 123,456 + 12,345?

    Answer

    123,456 + 12,345 =
    135,801

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

    123,456 + 12,345 in a column. Carries are the small circled digits above the columns.
    1carry1carry
    1 2 3 4 5 6
    +12345
    135801

    Column by column: 123,456 + 12,345

    • Ones: 6 + 5 = 11 — write 1, carry 1.
    • Tens: 5 + 4 + 1 = 10 — write 0, carry 1.
    • Hundreds: 4 + 3 + 1 = 8 — write 8.
    • Thousands: 3 + 2 = 5 — write 5.
    • Ten thousands: 2 + 1 = 3 — write 3.
    • Hundred thousands: nothing to add — write 1.

    123,456 + 12,345 = 135,801

    Second check: 135,801 − 123,456 = 12,345

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    https://calculat.io/en/number/long-addition/123456--12345Copy
    <a href="https://calculat.io/en/number/long-addition/123456--12345">123,456 + 12,345 = 135,801 - Addition with Regrouping</a>Copy
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    123,456 + 12,345 = 135,801 - Addition with Regrouping. 123,456 + 12,345 = 135,801. Addition with regrouping step by step: 2 carries, every digit of the sum and a subtraction check.
    https://calculat.io/en/number/long-addition/123456--12345/generated.jpgCopy

    Column additions with 12,345

    ExampleSum
    123,451 + 12,345135,796
    123,452 + 12,345135,797
    123,453 + 12,345135,798
    123,454 + 12,345135,799
    123,455 + 12,345135,800
    123,456 + 12,345135,801
    123,457 + 12,345135,802
    123,458 + 12,345135,803
    123,459 + 12,345135,804
    123,460 + 12,345135,805
    123,461 + 12,345135,806
    Recalculate with different values ↑

    FAQ

    What is 123,456 + 12,345?

    123,456 + 12,345 = 135,801

    How do you check that 123,456 + 12,345 = 135,801?

    Subtract one addend from the sum: 135,801 − 12,345 = 123,456, and 135,801 − 123,456 = 12,345. Getting the other addend back means the sum is right.

    How many carries are there in 123,456 + 12,345?

    2 carries: every time a column added up to 10 or more, its ones digit was written and 1 was carried to the next column on the left.

    Is 12,345 + 123,456 the same as 123,456 + 12,345?

    Yes. Addition is commutative, so both give 135,801; the column looks the same with either number on top.

    See Also