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    Column Addition: 15 + 12

    Addition with Regrouping Calculator
    First addend
    Second addend

    What is 15 + 12?

    Answer

    15 + 12 =
    27

    No regrouping: each column is added on its own

    15 + 12 in a column. No carries.
    1 5
    +12
    27

    Column by column: 15 + 12

    • Ones: 5 + 2 = 7 — write 7.
    • Tens: 1 + 1 = 2 — write 2.

    15 + 12 = 27

    Second check: 27 − 15 = 12

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    <a href="https://calculat.io/en/number/long-addition/15--12">15 + 12 = 27 - Column Addition - Calculatio</a>Copy
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    15 + 12 = 27 - Column Addition. 15 + 12 = 27. Column addition step by step: no carrying, every digit of the sum and a subtraction check.
    https://calculat.io/en/number/long-addition/15--12/generated.jpgCopy

    Column additions with 12

    ExampleSum
    12 + 1224
    15 + 1227
    17 + 1229
    19 + 1231
    23 + 1235
    26 + 1238
    28 + 1240
    34 + 1246
    36 + 1248
    39 + 1251
    41 + 1253
    45 + 1257
    47 + 1259
    52 + 1264
    54 + 1266
    58 + 1270
    63 + 1275
    65 + 1277
    67 + 1279
    69 + 1281
    Recalculate with different values ↑

    FAQ

    What is 15 + 12?

    15 + 12 = 27

    How do you check that 15 + 12 = 27?

    Subtract one addend from the sum: 27 − 12 = 15, and 27 − 15 = 12. Getting the other addend back means the sum is right.

    How many carries are there in 15 + 12?

    None: no column adds up to 10 or more, so every digit of the sum is written straight away.

    Is 12 + 15 the same as 15 + 12?

    Yes. Addition is commutative, so both give 27; the column looks the same with either number on top.

    See Also