Subtraction with Regrouping: 900 − 415

Subtraction with Regrouping Calculator
Minuend
Subtrahend

What is 900 − 415?

Answer

900 − 415 =
485

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 − 415 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)
−415
485

Column by column: 900 − 415

  • Ones: 0 is less than 5 — borrow 1 hundred across the zero: hundreds 9 → 8, tens 0 → 9; 10 − 5 = 5 — write 5.
  • Tens: after borrowing, 9; 9 − 1 = 8 — write 8.
  • Hundreds: after borrowing, 8; 8 − 4 = 4 — write 4.

900 − 415 = 485

Second check: 900 − 485 = 415

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FAQ

What is 900 − 415?

900 − 415 = 485

How do you check that 900 − 415 = 485?

Add the difference and the subtrahend: 485 + 415 = 900. Getting the minuend back means the difference is right.

How many times do you borrow in 900 − 415?

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 − 415?

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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