Subtraction with Regrouping: 800 − 12

Subtraction with Regrouping Calculator
Minuend
Subtrahend

What is 800 − 12?

Answer

800 − 12 =
788

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

800 − 12 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.
79+10
8(was 8, now 7)0(was 0, now 9)0 (was 0, now 10)
−12
788

Column by column: 800 − 12

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

800 − 12 = 788

Second check: 800 − 788 = 12

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Recalculate with different values ↑

Column subtractions of 12

ExampleDifference
300 − 12288
319 − 12307
360 − 12348
388 − 12376
400 − 12388
414 − 12402
465 − 12453
497 − 12485
500 − 12488
548 − 12536
590 − 12578
600 − 12588
659 − 12647
700 − 12688
800 − 12788
900 − 12888
1,000 − 12988
2,000 − 121,988
5,000 − 124,988
10,000 − 129,988

FAQ

What is 800 − 12?

800 − 12 = 788

How do you check that 800 − 12 = 788?

Add the difference and the subtrahend: 788 + 12 = 800. Getting the minuend back means the difference is right.

How many times do you borrow in 800 − 12?

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 800 − 12?

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