Subtraction with Regrouping: 504 − 128

Subtraction with Regrouping Calculator
Minuend
Subtrahend

What is 504 − 128?

Answer

504 − 128 =
376

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

504 − 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.
49+10
5(was 5, now 4)0(was 0, now 9)4 (was 4, now 14)
−128
376

Column by column: 504 − 128

  • Ones: 4 is less than 8 — borrow 1 hundred across the zero: hundreds 5 → 4, tens 0 → 9; 14 − 8 = 6 — write 6.
  • Tens: after borrowing, 9; 9 − 2 = 7 — write 7.
  • Hundreds: after borrowing, 4; 4 − 1 = 3 — write 3.

504 − 128 = 376

Second check: 504 − 376 = 128

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Column subtractions of 128

ExampleDifference
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
596 − 128468
613 − 128485
647 − 128519
664 − 128536
692 − 128564

FAQ

What is 504 − 128?

504 − 128 = 376

How do you check that 504 − 128 = 376?

Add the difference and the subtrahend: 376 + 128 = 504. Getting the minuend back means the difference is right.

How many times do you borrow in 504 − 128?

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 504 − 128?

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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