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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Recalculate with different values ↑

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

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.

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