Subtraction with Regrouping: 800 − 398

Subtraction with Regrouping Calculator
Minuend
Subtrahend

What is 800 − 398?

Answer

800 − 398 =
402

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 − 398 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)
−398
402

Column by column: 800 − 398

  • Ones: 0 is less than 8 — borrow 1 hundred across the zero: hundreds 8 → 7, tens 0 → 9; 10 − 8 = 2 — write 2.
  • Tens: after borrowing, 9; 9 − 9 = 0 — write 0.
  • Hundreds: after borrowing, 7; 7 − 3 = 4 — write 4.

800 − 398 = 402

Second check: 800 − 402 = 398

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Column subtractions from 800

ExampleDifference
800 − 12788
800 − 23777
800 − 36764
800 − 47753
800 − 63737
800 − 71729
800 − 83717
800 − 94706
800 − 136664
800 − 203597
800 − 222578
800 − 268532
800 − 315485
800 − 348452
800 − 398402

FAQ

What is 800 − 398?

800 − 398 = 402

How do you check that 800 − 398 = 402?

Add the difference and the subtrahend: 402 + 398 = 800. Getting the minuend back means the difference is right.

How many times do you borrow in 800 − 398?

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 − 398?

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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