Subtraction with Regrouping: 908 − 389

Subtraction with Regrouping Calculator
Minuend
Subtrahend

What is 908 − 389?

Answer

908 − 389 =
519

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

908 − 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.
89+10
9(was 9, now 8)0(was 0, now 9)8 (was 8, now 18)
−389
519

Column by column: 908 − 389

  • Ones: 8 is less than 9 — borrow 1 hundred across the zero: hundreds 9 → 8, tens 0 → 9; 18 − 9 = 9 — write 9.
  • Tens: after borrowing, 9; 9 − 8 = 1 — write 1.
  • Hundreds: after borrowing, 8; 8 − 3 = 5 — write 5.

908 − 389 = 519

Second check: 908 − 519 = 389

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Column subtractions of 389

ExampleDifference
903 − 389514
904 − 389515
905 − 389516
906 − 389517
907 − 389518
908 − 389519
909 − 389520
910 − 389521
911 − 389522
912 − 389523
913 − 389524

FAQ

What is 908 − 389?

908 − 389 = 519

How do you check that 908 − 389 = 519?

Add the difference and the subtrahend: 519 + 389 = 908. Getting the minuend back means the difference is right.

How many times do you borrow in 908 − 389?

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 908 − 389?

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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