Addition with Regrouping: 578 + 239

Addition with Regrouping Calculator
First addend
Second addend

What is 578 + 239?

Answer

578 + 239 =
817

With regrouping: 2 carries — into the tens and the hundreds

578 + 239 in a column. Carries are the small circled digits above the columns.
1carry1carry
5 7 8
+239
817

Column by column: 578 + 239

  • Ones: 8 + 9 = 17 — write 7, carry 1.
  • Tens: 7 + 3 + 1 = 11 — write 1, carry 1.
  • Hundreds: 5 + 2 + 1 = 8 — write 8.

578 + 239 = 817

Second check: 817 − 578 = 239

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FAQ

What is 578 + 239?

578 + 239 = 817

How do you check that 578 + 239 = 817?

Subtract one addend from the sum: 817 − 239 = 578, and 817 − 578 = 239. Getting the other addend back means the sum is right.

How many carries are there in 578 + 239?

2 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 239 + 578 the same as 578 + 239?

Yes. Addition is commutative, so both give 817; the column looks the same with either number on top.

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