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    Addition with Regrouping: 78 + 15

    Addition with Regrouping Calculator
    First addend
    Second addend

    What is 78 + 15?

    Answer

    78 + 15 =
    93

    With regrouping: 1 carry — into the tens

    78 + 15 in a column. Carries are the small circled digits above the columns.
    1carry
    7 8
    +15
    93

    Column by column: 78 + 15

    • Ones: 8 + 5 = 13 — write 3, carry 1.
    • Tens: 7 + 1 + 1 = 9 — write 9.

    78 + 15 = 93

    Second check: 93 − 78 = 15

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    78 + 15 = 93 - Addition with Regrouping. 78 + 15 = 93. Addition with regrouping step by step: 1 carry, every digit of the sum and a subtraction check.
    https://calculat.io/en/number/long-addition/78--15/generated.jpgCopy

    Column additions with 15

    ExampleSum
    52 + 1567
    54 + 1569
    58 + 1573
    63 + 1578
    65 + 1580
    67 + 1582
    69 + 1584
    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
    Recalculate with different values ↑

    FAQ

    What is 78 + 15?

    78 + 15 = 93

    How do you check that 78 + 15 = 93?

    Subtract one addend from the sum: 93 − 15 = 78, and 93 − 78 = 15. Getting the other addend back means the sum is right.

    How many carries are there in 78 + 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 + 78 the same as 78 + 15?

    Yes. Addition is commutative, so both give 93; the column looks the same with either number on top.

    See Also