Addition with Regrouping: 647 + 578

Addition with Regrouping Calculator
First addend
Second addend

What is 647 + 578?

Answer

647 + 578 =
1,225

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

647 + 578 in a column. Carries are the small circled digits above the columns.
1carry1carry1carry
6 4 7
+578
1225

Column by column: 647 + 578

  • Ones: 7 + 8 = 15 — write 5, carry 1.
  • Tens: 4 + 7 + 1 = 12 — write 2, carry 1.
  • Hundreds: 6 + 5 + 1 = 12 — write 2, carry 1.
  • Thousands: the carried 1 — write 1.

647 + 578 = 1,225

Second check: 1,225 − 647 = 578

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FAQ

What is 647 + 578?

647 + 578 = 1,225

How do you check that 647 + 578 = 1,225?

Subtract one addend from the sum: 1,225 − 578 = 647, and 1,225 − 647 = 578. Getting the other addend back means the sum is right.

How many carries are there in 647 + 578?

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 578 + 647 the same as 647 + 578?

Yes. Addition is commutative, so both give 1,225; the column looks the same with either number on top.

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