Subtraction with Regrouping: 20,387 − 8,042

Subtraction with Regrouping Calculator
Minuend
Subtrahend

What is 20,387 − 8,042?

Answer

20,387 − 8,042 =
12,345

With regrouping: 1 borrow — from the ten thousands

20,387 − 8,042 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.
1+10
2(was 2, now 1)0 (was 0, now 10)3 8 7
−8042
12345

Column by column: 20,387 − 8,042

  • Ones: 7 − 2 = 5 — write 5.
  • Tens: 8 − 4 = 4 — write 4.
  • Hundreds: 3 − 0 = 3 — write 3.
  • Thousands: 0 is less than 8 — borrow 1 ten thousand: ten thousands 2 → 1; 10 − 8 = 2 — write 2.
  • Ten thousands: after borrowing, 1; nothing to subtract — write 1.

20,387 − 8,042 = 12,345

Second check: 20,387 − 12,345 = 8,042

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Column subtractions of 8,042

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20,386 − 8,04212,344
20,387 − 8,04212,345
20,388 − 8,04212,346
20,389 − 8,04212,347
20,390 − 8,04212,348
20,391 − 8,04212,349
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FAQ

What is 20,387 − 8,042?

20,387 − 8,042 = 12,345

How do you check that 20,387 − 8,042 = 12,345?

Add the difference and the subtrahend: 12,345 + 8,042 = 20,387. Getting the minuend back means the difference is right.

How many times do you borrow in 20,387 − 8,042?

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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