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    Subtraction with Regrouping: 123 − 45

    Subtraction with Regrouping Calculator
    Minuend
    Subtrahend

    What is 123 − 45?

    Answer

    123 − 45 =
    78

    With regrouping: 2 borrows — from the tens and the hundreds

    123 − 45 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.
    011+10
    1(was 1, now 0)2(was 2, now 11)3 (was 3, now 13)
    −45
    78

    Column by column: 123 − 45

    • Ones: 3 is less than 5 — borrow 1 ten: tens 2 → 1; 13 − 5 = 8 — write 8.
    • Tens: after borrowing, 1; 1 is less than 4 — borrow 1 hundred: hundreds 1 → 0; 11 − 4 = 7 — write 7.
    • Hundreds: after borrowing, 0 — a leading zero is not written.

    123 − 45 = 78

    Second check: 123 − 78 = 45

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    123 − 45 = 78 - Subtraction with Regrouping. 123 − 45 = 78. Subtraction with regrouping step by step: 2 borrows, every digit of the difference and an addition check.
    https://calculat.io/en/number/long-subtraction/123--45/generated.jpgCopy

    Column subtractions of 45

    ExampleDifference
    97 − 4552
    99 − 4554
    103 − 4558
    108 − 4563
    110 − 4565
    112 − 4567
    114 − 4569
    116 − 4571
    119 − 4574
    121 − 4576
    123 − 4578
    128 − 4583
    130 − 4585
    134 − 4589
    137 − 4592
    139 − 4594
    143 − 4598
    150 − 45105
    181 − 45136
    217 − 45172
    Recalculate with different values ↑

    FAQ

    What is 123 − 45?

    123 − 45 = 78

    How do you check that 123 − 45 = 78?

    Add the difference and the subtrahend: 78 + 45 = 123. Getting the minuend back means the difference is right.

    How many times do you borrow in 123 − 45?

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

    See Also