Subtraction with Regrouping: 791 − 389

Subtraction with Regrouping Calculator
Minuend
Subtrahend

What is 791 − 389?

Answer

791 − 389 =
402

With regrouping: 1 borrow — from the tens

791 − 389 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.
8+10
7 9(was 9, now 8)1 (was 1, now 11)
−389
402

Column by column: 791 − 389

  • Ones: 1 is less than 9 — borrow 1 ten: tens 9 → 8; 11 − 9 = 2 — write 2.
  • Tens: after borrowing, 8; 8 − 8 = 0 — write 0.
  • Hundreds: 7 − 3 = 4 — write 4.

791 − 389 = 402

Second check: 791 − 402 = 389

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Column subtractions of 389

ExampleDifference
786 − 389397
787 − 389398
788 − 389399
789 − 389400
790 − 389401
791 − 389402
792 − 389403
793 − 389404
794 − 389405
795 − 389406
796 − 389407

FAQ

What is 791 − 389?

791 − 389 = 402

How do you check that 791 − 389 = 402?

Add the difference and the subtrahend: 402 + 389 = 791. Getting the minuend back means the difference is right.

How many times do you borrow in 791 − 389?

1 borrow: each time the top digit was smaller than the one below it, 1 was borrowed from the column on the left.

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