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    Subtraction with Regrouping: 104 − 15

    Subtraction with Regrouping Calculator
    Minuend
    Subtrahend

    What is 104 − 15?

    Answer

    104 − 15 =
    89

    With regrouping across a zero: 2 borrows — there are no tens to borrow from, so 1 hundred becomes 10 tens, and 1 ten goes to the ones

    104 − 15 in a column. Above the columns: the values after borrowing — a crossed-out digit is replaced by the number above it; +10 marks a column that received a borrowed ten.
    09+10
    1(was 1, now 0)0(was 0, now 9)4 (was 4, now 14)
    −15
    89

    Column by column: 104 − 15

    • Ones: 4 is less than 5 — borrow 1 hundred across the zero: hundreds 1 → 0, tens 0 → 9; 14 − 5 = 9 — write 9.
    • Tens: after borrowing, 9; 9 − 1 = 8 — write 8.
    • Hundreds: after borrowing, 0 — a leading zero is not written.

    104 − 15 = 89

    Second check: 104 − 89 = 15

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    104 − 15 = 89 - Subtraction with Regrouping. 104 − 15 = 89. Subtraction with regrouping step by step: 2 borrows across a zero, every digit of the difference and an addition check.
    https://calculat.io/en/number/long-subtraction/104--15/generated.jpgCopy

    Column subtractions of 15

    ExampleDifference
    78 − 1563
    80 − 1565
    82 − 1567
    84 − 1569
    86 − 1571
    89 − 1574
    91 − 1576
    93 − 1578
    98 − 1583
    100 − 1585
    104 − 1589
    107 − 1592
    109 − 1594
    113 − 1598
    120 − 15105
    151 − 15136
    187 − 15172
    218 − 15203
    254 − 15239
    283 − 15268
    Recalculate with different values ↑

    FAQ

    What is 104 − 15?

    104 − 15 = 89

    How do you check that 104 − 15 = 89?

    Add the difference and the subtrahend: 89 + 15 = 104. Getting the minuend back means the difference is right.

    How many times do you borrow in 104 − 15?

    2 borrows: each time the top digit was smaller than the one below it, 1 was borrowed from the column on the left.

    Why does 0 become 9 when borrowing in 104 − 15?

    The zero has nothing to lend, so it first borrows 1 from its left neighbour and becomes 10; then it lends 1 to the column on its right and keeps 9.

    See Also