Subtraction with Regrouping: 721 − 74

Subtraction with Regrouping Calculator
Minuend
Subtrahend

What is 721 − 74?

Answer

721 − 74 =
647

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

721 − 74 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.
611+10
7(was 7, now 6)2(was 2, now 11)1 (was 1, now 11)
−74
647

Column by column: 721 − 74

  • Ones: 1 is less than 4 — borrow 1 ten: tens 2 → 1; 11 − 4 = 7 — write 7.
  • Tens: after borrowing, 1; 1 is less than 7 — borrow 1 hundred: hundreds 7 → 6; 11 − 7 = 4 — write 4.
  • Hundreds: after borrowing, 6; nothing to subtract — write 6.

721 − 74 = 647

Second check: 721 − 647 = 74

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Column subtractions of 74

ExampleDifference
168 − 7494
172 − 7498
179 − 74105
210 − 74136
246 − 74172
277 − 74203
313 − 74239
342 − 74268
381 − 74307
400 − 74326
422 − 74348
450 − 74376
476 − 74402
500 − 74426
527 − 74453
559 − 74485
600 − 74526
610 − 74536
652 − 74578
721 − 74647

FAQ

What is 721 − 74?

721 − 74 = 647

How do you check that 721 − 74 = 647?

Add the difference and the subtrahend: 647 + 74 = 721. Getting the minuend back means the difference is right.

How many times do you borrow in 721 − 74?

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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