Subtraction with Regrouping: 1,021 − 485

Subtraction with Regrouping Calculator
Minuend
Subtrahend

What is 1,021 − 485?

Answer

1,021 − 485 =
536

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

1,021 − 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.
0911+10
1(was 1, now 0)0(was 0, now 9)2(was 2, now 11)1 (was 1, now 11)
−485
536

Column by column: 1,021 − 485

  • Ones: 1 is less than 5 — borrow 1 ten: tens 2 → 1; 11 − 5 = 6 — write 6.
  • Tens: after borrowing, 1; 1 is less than 8 — borrow 1 thousand across the zero: thousands 1 → 0, hundreds 0 → 9; 11 − 8 = 3 — write 3.
  • Hundreds: after borrowing, 9; 9 − 4 = 5 — write 5.
  • Thousands: after borrowing, 0 — a leading zero is not written.

1,021 − 485 = 536

Second check: 1,021 − 536 = 485

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Column subtractions of 485

ExampleDifference
1,016 − 485531
1,017 − 485532
1,018 − 485533
1,019 − 485534
1,020 − 485535
1,021 − 485536
1,022 − 485537
1,023 − 485538
1,024 − 485539
1,025 − 485540
1,026 − 485541

FAQ

What is 1,021 − 485?

1,021 − 485 = 536

How do you check that 1,021 − 485 = 536?

Add the difference and the subtrahend: 536 + 485 = 1,021. Getting the minuend back means the difference is right.

How many times do you borrow in 1,021 − 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 1,021 − 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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