Subtraction with Regrouping: 817 − 239

Subtraction with Regrouping Calculator
Minuend
Subtrahend

What is 817 − 239?

Answer

817 − 239 =
578

With regrouping: 2 borrows — from the tens and the hundreds

817 − 239 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.
710+10
8(was 8, now 7)1(was 1, now 10)7 (was 7, now 17)
−239
578

Column by column: 817 − 239

  • Ones: 7 is less than 9 — borrow 1 ten: tens 1 → 0; 17 − 9 = 8 — write 8.
  • Tens: after borrowing, 0; 0 is less than 3 — borrow 1 hundred: hundreds 8 → 7; 10 − 3 = 7 — write 7.
  • Hundreds: after borrowing, 7; 7 − 2 = 5 — write 5.

817 − 239 = 578

Second check: 817 − 578 = 239

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ExampleDifference
507 − 239268
530 − 239291
546 − 239307
564 − 239325
587 − 239348
593 − 239354
615 − 239376
628 − 239389
641 − 239402
666 − 239427
692 − 239453
707 − 239468
724 − 239485
758 − 239519
775 − 239536
803 − 239564
817 − 239578
841 − 239602
886 − 239647
922 − 239683

FAQ

What is 817 − 239?

817 − 239 = 578

How do you check that 817 − 239 = 578?

Add the difference and the subtrahend: 578 + 239 = 817. Getting the minuend back means the difference is right.

How many times do you borrow in 817 − 239?

2 borrows: 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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