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    Subtraction with Regrouping: 800 − 71

    Subtraction with Regrouping Calculator
    Minuend
    Subtrahend

    What is 800 − 71?

    Answer

    800 − 71 =
    729

    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

    800 − 71 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.
    79+10
    8(was 8, now 7)0(was 0, now 9)0 (was 0, now 10)
    −71
    729

    Column by column: 800 − 71

    • Ones: 0 is less than 1 — borrow 1 hundred across the zero: hundreds 8 → 7, tens 0 → 9; 10 − 1 = 9 — write 9.
    • Tens: after borrowing, 9; 9 − 7 = 2 — write 2.
    • Hundreds: after borrowing, 7; nothing to subtract — write 7.

    800 − 71 = 729

    Second check: 800 − 729 = 71

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    800 − 71 = 729 - Subtraction with Regrouping. 800 − 71 = 729. 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/800--71/generated.jpgCopy

    Column subtractions of 71

    ExampleDifference
    274 − 71203
    300 − 71229
    310 − 71239
    339 − 71268
    378 − 71307
    419 − 71348
    447 − 71376
    473 − 71402
    524 − 71453
    556 − 71485
    607 − 71536
    649 − 71578
    700 − 71629
    718 − 71647
    800 − 71729
    900 − 71829
    1,000 − 71929
    2,000 − 711,929
    5,000 − 714,929
    10,000 − 719,929
    Recalculate with different values ↑

    FAQ

    What is 800 − 71?

    800 − 71 = 729

    How do you check that 800 − 71 = 729?

    Add the difference and the subtrahend: 729 + 71 = 800. Getting the minuend back means the difference is right.

    How many times do you borrow in 800 − 71?

    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 800 − 71?

    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