Subtraction with Regrouping: 1,004 − 485

Subtraction with Regrouping Calculator
Minuend
Subtrahend

What is 1,004 − 485?

Answer

1,004 − 485 =
519

With regrouping across a zero: 3 borrows — there are no hundreds or tens to borrow from, so 1 thousand becomes 10 hundreds, and 1 ten goes to the ones

1,004 − 485 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.
099+10
1(was 1, now 0)0(was 0, now 9)0(was 0, now 9)4 (was 4, now 14)
−485
519

Column by column: 1,004 − 485

  • Ones: 4 is less than 5 — borrow 1 thousand across the zero: thousands 1 → 0, hundreds 0 → 9, tens 0 → 9; 14 − 5 = 9 — write 9.
  • Tens: after borrowing, 9; 9 − 8 = 1 — write 1.
  • Hundreds: after borrowing, 9; 9 − 4 = 5 — write 5.
  • Thousands: after borrowing, 0 — a leading zero is not written.

1,004 − 485 = 519

Second check: 1,004 − 519 = 485

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Recalculate with different values ↑

Column subtractions of 485

ExampleDifference
999 − 485514
1,000 − 485515
1,001 − 485516
1,002 − 485517
1,003 − 485518
1,004 − 485519
1,005 − 485520
1,006 − 485521
1,007 − 485522
1,008 − 485523
1,009 − 485524

FAQ

What is 1,004 − 485?

1,004 − 485 = 519

How do you check that 1,004 − 485 = 519?

Add the difference and the subtrahend: 519 + 485 = 1,004. Getting the minuend back means the difference is right.

How many times do you borrow in 1,004 − 485?

3 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 1,004 − 485?

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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