Subtraction with Regrouping: 900 − 71

Subtraction with Regrouping Calculator
Minuend
Subtrahend

What is 900 − 71?

Answer

900 − 71 =
829

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 − 71 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)
−71
829

Column by column: 900 − 71

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

900 − 71 = 829

Second check: 900 − 829 = 71

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Column subtractions of 71

ExampleDifference
274 − 71203
300 − 71229
310 − 71239
339 − 71268
378 − 71307
419 − 71348
447 − 71376
473 − 71402
524 − 71453
556 − 71485
607 − 71536
649 − 71578
700 − 71629
718 − 71647
800 − 71729
900 − 71829
1,000 − 71929
2,000 − 711,929
5,000 − 714,929
10,000 − 719,929

FAQ

What is 900 − 71?

900 − 71 = 829

How do you check that 900 − 71 = 829?

Add the difference and the subtrahend: 829 + 71 = 900. Getting the minuend back means the difference is right.

How many times do you borrow in 900 − 71?

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 − 71?

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.

See Also