Addition with Regrouping: 578 + 322

Addition with Regrouping Calculator
First addend
Second addend

What is 578 + 322?

Answer

578 + 322 =
900

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

578 + 322 in a column. Carries are the small circled digits above the columns.
1carry1carry
5 7 8
+322
900

Column by column: 578 + 322

  • Ones: 8 + 2 = 10 — write 0, carry 1.
  • Tens: 7 + 2 + 1 = 10 — write 0, carry 1.
  • Hundreds: 5 + 3 + 1 = 9 — write 9.

578 + 322 = 900

Second check: 900 − 578 = 322

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FAQ

What is 578 + 322?

578 + 322 = 900

How do you check that 578 + 322 = 900?

Subtract one addend from the sum: 900 − 322 = 578, and 900 − 578 = 322. Getting the other addend back means the sum is right.

How many carries are there in 578 + 322?

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 322 + 578 the same as 578 + 322?

Yes. Addition is commutative, so both give 900; the column looks the same with either number on top.