Addition with Regrouping: 578 + 15

Addition with Regrouping Calculator
First addend
Second addend

What is 578 + 15?

Answer

578 + 15 =
593

With regrouping: 1 carry — into the tens

578 + 15 in a column. Carries are the small circled digits above the columns.
1carry
5 7 8
+15
593

Column by column: 578 + 15

  • Ones: 8 + 5 = 13 — write 3, carry 1.
  • Tens: 7 + 1 + 1 = 9 — write 9.
  • Hundreds: nothing to add — write 5.

578 + 15 = 593

Second check: 593 − 578 = 15

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FAQ

What is 578 + 15?

578 + 15 = 593

How do you check that 578 + 15 = 593?

Subtract one addend from the sum: 593 − 15 = 578, and 593 − 578 = 15. Getting the other addend back means the sum is right.

How many carries are there in 578 + 15?

1 carry: 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 15 + 578 the same as 578 + 15?

Yes. Addition is commutative, so both give 593; the column looks the same with either number on top.