Addition with Regrouping: 578 + 427

Addition with Regrouping Calculator
First addend
Second addend

What is 578 + 427?

Answer

578 + 427 =
1,005

The sum is longer than the addends: 3 carries — into the tens, the hundreds and the thousands; the last one makes a new digit

578 + 427 in a column. Carries are the small circled digits above the columns.
1carry1carry1carry
5 7 8
+427
1005

Column by column: 578 + 427

  • Ones: 8 + 7 = 15 — write 5, carry 1.
  • Tens: 7 + 2 + 1 = 10 — write 0, carry 1.
  • Hundreds: 5 + 4 + 1 = 10 — write 0, carry 1.
  • Thousands: the carried 1 — write 1.

578 + 427 = 1,005

Second check: 1,005 − 578 = 427

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FAQ

What is 578 + 427?

578 + 427 = 1,005

How do you check that 578 + 427 = 1,005?

Subtract one addend from the sum: 1,005 − 427 = 578, and 1,005 − 578 = 427. Getting the other addend back means the sum is right.

How many carries are there in 578 + 427?

3 carries: every time a column added up to 10 or more, its ones digit was written and 1 was carried to the next column on the left.

Is 427 + 578 the same as 578 + 427?

Yes. Addition is commutative, so both give 1,005; the column looks the same with either number on top.

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