Subtraction with Regrouping: 321 − 149

Subtraction with Regrouping Calculator
Minuend
Subtrahend

What is 321 − 149?

Answer

321 − 149 =
172

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

321 − 149 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.
211+10
3(was 3, now 2)2(was 2, now 11)1 (was 1, now 11)
−149
172

Column by column: 321 − 149

  • Ones: 1 is less than 9 — borrow 1 ten: tens 2 → 1; 11 − 9 = 2 — write 2.
  • Tens: after borrowing, 1; 1 is less than 4 — borrow 1 hundred: hundreds 3 → 2; 11 − 4 = 7 — write 7.
  • Hundreds: after borrowing, 2; 2 − 1 = 1 — write 1.

321 − 149 = 172

Second check: 321 − 172 = 149

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Column subtractions of 149

ExampleDifference
298 − 149149
321 − 149172
336 − 149187
352 − 149203
363 − 149214
388 − 149239
400 − 149251
405 − 149256
417 − 149268
440 − 149291
456 − 149307
474 − 149325
497 − 149348
500 − 149351
503 − 149354
525 − 149376
538 − 149389
551 − 149402
576 − 149427
600 − 149451

FAQ

What is 321 − 149?

321 − 149 = 172

How do you check that 321 − 149 = 172?

Add the difference and the subtrahend: 172 + 149 = 321. Getting the minuend back means the difference is right.

How many times do you borrow in 321 − 149?

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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