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    Subtraction with Regrouping: 502 − 17

    Subtraction with Regrouping Calculator
    Minuend
    Subtrahend

    What is 502 − 17?

    Answer

    502 − 17 =
    485

    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

    502 − 17 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.
    49+10
    5(was 5, now 4)0(was 0, now 9)2 (was 2, now 12)
    −17
    485

    Column by column: 502 − 17

    • Ones: 2 is less than 7 — borrow 1 hundred across the zero: hundreds 5 → 4, tens 0 → 9; 12 − 7 = 5 — write 5.
    • Tens: after borrowing, 9; 9 − 1 = 8 — write 8.
    • Hundreds: after borrowing, 4; nothing to subtract — write 4.

    502 − 17 = 485

    Second check: 502 − 485 = 17

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    502 − 17 = 485 - Subtraction with Regrouping. 502 − 17 = 485. 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/502--17/generated.jpgCopy

    Column subtractions of 17

    ExampleDifference
    109 − 1792
    111 − 1794
    115 − 1798
    122 − 17105
    153 − 17136
    189 − 17172
    200 − 17183
    220 − 17203
    256 − 17239
    285 − 17268
    300 − 17283
    324 − 17307
    365 − 17348
    393 − 17376
    419 − 17402
    470 − 17453
    502 − 17485
    553 − 17536
    595 − 17578
    664 − 17647
    Recalculate with different values ↑

    FAQ

    What is 502 − 17?

    502 − 17 = 485

    How do you check that 502 − 17 = 485?

    Add the difference and the subtrahend: 485 + 17 = 502. Getting the minuend back means the difference is right.

    How many times do you borrow in 502 − 17?

    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 502 − 17?

    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