Subtraction with Regrouping: 645 − 291

Subtraction with Regrouping Calculator
Minuend
Subtrahend

What is 645 − 291?

Answer

645 − 291 =
354

With regrouping: 1 borrow — from the hundreds

645 − 291 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.
5+10
6(was 6, now 5)4 (was 4, now 14)5
−291
354

Column by column: 645 − 291

  • Ones: 5 − 1 = 4 — write 4.
  • Tens: 4 is less than 9 — borrow 1 hundred: hundreds 6 → 5; 14 − 9 = 5 — write 5.
  • Hundreds: after borrowing, 5; 5 − 2 = 3 — write 3.

645 − 291 = 354

Second check: 645 − 354 = 291

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Column subtractions of 291

ExampleDifference
582 − 291291
598 − 291307
616 − 291325
639 − 291348
645 − 291354
667 − 291376
680 − 291389
693 − 291402
718 − 291427
744 − 291453
759 − 291468
776 − 291485
810 − 291519
827 − 291536
855 − 291564
869 − 291578
893 − 291602
938 − 291647
974 − 291683

FAQ

What is 645 − 291?

645 − 291 = 354

How do you check that 645 − 291 = 354?

Add the difference and the subtrahend: 354 + 291 = 645. Getting the minuend back means the difference is right.

How many times do you borrow in 645 − 291?

1 borrow: 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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