Addition with Regrouping: 578 + 122

Addition with Regrouping Calculator
First addend
Second addend

What is 578 + 122?

Answer

578 + 122 =
700

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

578 + 122 in a column. Carries are the small circled digits above the columns.
1carry1carry
5 7 8
+122
700

Column by column: 578 + 122

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

578 + 122 = 700

Second check: 700 − 578 = 122

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FAQ

What is 578 + 122?

578 + 122 = 700

How do you check that 578 + 122 = 700?

Subtract one addend from the sum: 700 − 122 = 578, and 700 − 578 = 122. Getting the other addend back means the sum is right.

How many carries are there in 578 + 122?

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 122 + 578 the same as 578 + 122?

Yes. Addition is commutative, so both give 700; the column looks the same with either number on top.

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