Subtraction with Regrouping: 706 − 128

Subtraction with Regrouping Calculator
Minuend
Subtrahend

What is 706 − 128?

Answer

706 − 128 =
578

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

706 − 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.
69+10
7(was 7, now 6)0(was 0, now 9)6 (was 6, now 16)
−128
578

Column by column: 706 − 128

  • Ones: 6 is less than 8 — borrow 1 hundred across the zero: hundreds 7 → 6, tens 0 → 9; 16 − 8 = 8 — write 8.
  • Tens: after borrowing, 9; 9 − 2 = 7 — write 7.
  • Hundreds: after borrowing, 6; 6 − 1 = 5 — write 5.

706 − 128 = 578

Second check: 706 − 578 = 128

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396 − 128268
419 − 128291
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453 − 128325
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555 − 128427
581 − 128453
596 − 128468
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647 − 128519
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FAQ

What is 706 − 128?

706 − 128 = 578

How do you check that 706 − 128 = 578?

Add the difference and the subtrahend: 578 + 128 = 706. Getting the minuend back means the difference is right.

How many times do you borrow in 706 − 128?

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 706 − 128?

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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