Subtraction with Regrouping: 900 − 23

Subtraction with Regrouping Calculator
Minuend
Subtrahend

What is 900 − 23?

Answer

900 − 23 =
877

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

900 − 23 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.
89+10
9(was 9, now 8)0(was 0, now 9)0 (was 0, now 10)
−23
877

Column by column: 900 − 23

  • Ones: 0 is less than 3 — borrow 1 hundred across the zero: hundreds 9 → 8, tens 0 → 9; 10 − 3 = 7 — write 7.
  • Tens: after borrowing, 9; 9 − 2 = 7 — write 7.
  • Hundreds: after borrowing, 8; nothing to subtract — write 8.

900 − 23 = 877

Second check: 900 − 877 = 23

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Column subtractions of 23

ExampleDifference
226 − 23203
262 − 23239
291 − 23268
300 − 23277
330 − 23307
371 − 23348
399 − 23376
425 − 23402
476 − 23453
508 − 23485
559 − 23536
601 − 23578
670 − 23647
700 − 23677
800 − 23777
900 − 23877
1,000 − 23977
2,000 − 231,977
5,000 − 234,977
10,000 − 239,977

FAQ

What is 900 − 23?

900 − 23 = 877

How do you check that 900 − 23 = 877?

Add the difference and the subtrahend: 877 + 23 = 900. Getting the minuend back means the difference is right.

How many times do you borrow in 900 − 23?

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 900 − 23?

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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