Subtraction with Regrouping: 315 − 128

Subtraction with Regrouping Calculator
Minuend
Subtrahend

What is 315 − 128?

Answer

315 − 128 =
187

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

315 − 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.
210+10
3(was 3, now 2)1(was 1, now 10)5 (was 5, now 15)
−128
187

Column by column: 315 − 128

  • Ones: 5 is less than 8 — borrow 1 ten: tens 1 → 0; 15 − 8 = 7 — write 7.
  • Tens: after borrowing, 0; 0 is less than 2 — borrow 1 hundred: hundreds 3 → 2; 10 − 2 = 8 — write 8.
  • Hundreds: after borrowing, 2; 2 − 1 = 1 — write 1.

315 − 128 = 187

Second check: 315 − 187 = 128

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Column subtractions of 128

ExampleDifference
256 − 128128
264 − 128136
277 − 128149
300 − 128172
315 − 128187
331 − 128203
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

FAQ

What is 315 − 128?

315 − 128 = 187

How do you check that 315 − 128 = 187?

Add the difference and the subtrahend: 187 + 128 = 315. Getting the minuend back means the difference is right.

How many times do you borrow in 315 − 128?

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

See Also