Subtraction with Regrouping: 903 − 256

Subtraction with Regrouping Calculator
Minuend
Subtrahend

What is 903 − 256?

Answer

903 − 256 =
647

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

903 − 256 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)3 (was 3, now 13)
−256
647

Column by column: 903 − 256

  • Ones: 3 is less than 6 — borrow 1 hundred across the zero: hundreds 9 → 8, tens 0 → 9; 13 − 6 = 7 — write 7.
  • Tens: after borrowing, 9; 9 − 5 = 4 — write 4.
  • Hundreds: after borrowing, 8; 8 − 2 = 6 — write 6.

903 − 256 = 647

Second check: 903 − 647 = 256

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FAQ

What is 903 − 256?

903 − 256 = 647

How do you check that 903 − 256 = 647?

Add the difference and the subtrahend: 647 + 256 = 903. Getting the minuend back means the difference is right.

How many times do you borrow in 903 − 256?

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 903 − 256?

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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