Subtraction with Regrouping: 664 − 128

Subtraction with Regrouping Calculator
Minuend
Subtrahend

What is 664 − 128?

Answer

664 − 128 =
536

With regrouping: 1 borrow — from the tens

664 − 128 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.
5+10
6 6(was 6, now 5)4 (was 4, now 14)
−128
536

Column by column: 664 − 128

  • Ones: 4 is less than 8 — borrow 1 ten: tens 6 → 5; 14 − 8 = 6 — write 6.
  • Tens: after borrowing, 5; 5 − 2 = 3 — write 3.
  • Hundreds: 6 − 1 = 5 — write 5.

664 − 128 = 536

Second check: 664 − 536 = 128

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FAQ

What is 664 − 128?

664 − 128 = 536

How do you check that 664 − 128 = 536?

Add the difference and the subtrahend: 536 + 128 = 664. Getting the minuend back means the difference is right.

How many times do you borrow in 664 − 128?

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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