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    Subtraction with Regrouping: 100 − 29

    Subtraction with Regrouping Calculator
    Minuend
    Subtrahend

    What is 100 − 29?

    Answer

    100 − 29 =
    71

    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

    100 − 29 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)0 (was 0, now 10)
    −29
    71

    Column by column: 100 − 29

    • Ones: 0 is less than 9 — borrow 1 hundred across the zero: hundreds 1 → 0, tens 0 → 9; 10 − 9 = 1 — write 1.
    • Tens: after borrowing, 9; 9 − 2 = 7 — write 7.
    • Hundreds: after borrowing, 0 — a leading zero is not written.

    100 − 29 = 71

    Second check: 100 − 71 = 29

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    https://calculat.io/en/number/long-subtraction/100--29Copy
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    100 − 29 = 71 - Subtraction with Regrouping. 100 − 29 = 71. 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/100--29/generated.jpgCopy

    Column subtractions from 100

    ExampleDifference
    100 − 694
    100 − 1189
    100 − 1288
    100 − 1585
    100 − 1783
    100 − 2377
    100 − 2476
    100 − 2674
    100 − 2872
    100 − 2971
    100 − 3367
    100 − 3664
    100 − 3763
    100 − 4159
    100 − 4654
    100 − 4753
    Recalculate with different values ↑

    FAQ

    What is 100 − 29?

    100 − 29 = 71

    How do you check that 100 − 29 = 71?

    Add the difference and the subtrahend: 71 + 29 = 100. Getting the minuend back means the difference is right.

    How many times do you borrow in 100 − 29?

    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 100 − 29?

    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