Subtraction with Regrouping: 991 − 427

Subtraction with Regrouping Calculator
Minuend
Subtrahend

What is 991 − 427?

Answer

991 − 427 =
564

With regrouping: 1 borrow — from the tens

991 − 427 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
9 9(was 9, now 8)1 (was 1, now 11)
−427
564

Column by column: 991 − 427

  • Ones: 1 is less than 7 — borrow 1 ten: tens 9 → 8; 11 − 7 = 4 — write 4.
  • Tens: after borrowing, 8; 8 − 2 = 6 — write 6.
  • Hundreds: 9 − 4 = 5 — write 5.

991 − 427 = 564

Second check: 991 − 564 = 427

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FAQ

What is 991 − 427?

991 − 427 = 564

How do you check that 991 − 427 = 564?

Add the difference and the subtrahend: 564 + 427 = 991. Getting the minuend back means the difference is right.

How many times do you borrow in 991 − 427?

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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