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    Addition with Regrouping: 105 + 15

    Addition with Regrouping Calculator
    First addend
    Second addend

    What is 105 + 15?

    Answer

    105 + 15 =
    120

    With regrouping: 1 carry — into the tens

    105 + 15 in a column. Carries are the small circled digits above the columns.
    1carry
    1 0 5
    +15
    120

    Column by column: 105 + 15

    • Ones: 5 + 5 = 10 — write 0, carry 1.
    • Tens: 0 + 1 + 1 = 2 — write 2.
    • Hundreds: nothing to add — write 1.

    105 + 15 = 120

    Second check: 120 − 105 = 15

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    105 + 15 = 120 - Addition with Regrouping. 105 + 15 = 120. Addition with regrouping step by step: 1 carry, every digit of the sum and a subtraction check.
    https://calculat.io/en/number/long-addition/105--15/generated.jpgCopy

    Column additions with 15

    ExampleSum
    71 + 1586
    74 + 1589
    76 + 1591
    78 + 1593
    83 + 1598
    85 + 15100
    89 + 15104
    92 + 15107
    94 + 15109
    98 + 15113
    105 + 15120
    136 + 15151
    172 + 15187
    203 + 15218
    239 + 15254
    268 + 15283
    307 + 15322
    348 + 15363
    376 + 15391
    402 + 15417
    Recalculate with different values ↑

    FAQ

    What is 105 + 15?

    105 + 15 = 120

    How do you check that 105 + 15 = 120?

    Subtract one addend from the sum: 120 − 15 = 105, and 120 − 105 = 15. Getting the other addend back means the sum is right.

    How many carries are there in 105 + 15?

    1 carry: 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 15 + 105 the same as 105 + 15?

    Yes. Addition is commutative, so both give 120; the column looks the same with either number on top.

    See Also