Subtraction with Regrouping: 503 − 149

Subtraction with Regrouping Calculator
Minuend
Subtrahend

What is 503 − 149?

Answer

503 − 149 =
354

With regrouping across a zero: 2 borrows — there are no tens to borrow from, so 1 hundred becomes 10 tens, and 1 ten goes to the ones

503 − 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.
49+10
5(was 5, now 4)0(was 0, now 9)3 (was 3, now 13)
−149
354

Column by column: 503 − 149

  • Ones: 3 is less than 9 — borrow 1 hundred across the zero: hundreds 5 → 4, tens 0 → 9; 13 − 9 = 4 — write 4.
  • Tens: after borrowing, 9; 9 − 4 = 5 — write 5.
  • Hundreds: after borrowing, 4; 4 − 1 = 3 — write 3.

503 − 149 = 354

Second check: 503 − 354 = 149

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Column subtractions of 149

ExampleDifference
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
602 − 149453
617 − 149468
634 − 149485
668 − 149519

FAQ

What is 503 − 149?

503 − 149 = 354

How do you check that 503 − 149 = 354?

Add the difference and the subtrahend: 354 + 149 = 503. Getting the minuend back means the difference is right.

How many times do you borrow in 503 − 149?

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

Why does 0 become 9 when borrowing in 503 − 149?

The zero has nothing to lend, so it first borrows 1 from its left neighbour and becomes 10; then it lends 1 to the column on its right and keeps 9.

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