Subtraction with Regrouping: 517 − 128

Subtraction with Regrouping Calculator
Minuend
Subtrahend

What is 517 − 128?

Answer

517 − 128 =
389

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

517 − 128 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.
410+10
5(was 5, now 4)1(was 1, now 10)7 (was 7, now 17)
−128
389

Column by column: 517 − 128

  • Ones: 7 is less than 8 — borrow 1 ten: tens 1 → 0; 17 − 8 = 9 — write 9.
  • Tens: after borrowing, 0; 0 is less than 2 — borrow 1 hundred: hundreds 5 → 4; 10 − 2 = 8 — write 8.
  • Hundreds: after borrowing, 4; 4 − 1 = 3 — write 3.

517 − 128 = 389

Second check: 517 − 389 = 128

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Column subtractions of 128

ExampleDifference
342 − 128214
367 − 128239
384 − 128256
396 − 128268
419 − 128291
435 − 128307
453 − 128325
476 − 128348
482 − 128354
504 − 128376
517 − 128389
530 − 128402
555 − 128427
581 − 128453
596 − 128468
613 − 128485
647 − 128519
664 − 128536
692 − 128564
706 − 128578

FAQ

What is 517 − 128?

517 − 128 = 389

How do you check that 517 − 128 = 389?

Add the difference and the subtrahend: 389 + 128 = 517. Getting the minuend back means the difference is right.

How many times do you borrow in 517 − 128?

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

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