Addition with Regrouping: 307 + 15

Addition with Regrouping Calculator
First addend
Second addend

What is 307 + 15?

Answer

307 + 15 =
322

With regrouping: 1 carry — into the tens

307 + 15 in a column. Carries are the small circled digits above the columns.
1carry
3 0 7
+15
322

Column by column: 307 + 15

  • Ones: 7 + 5 = 12 — write 2, carry 1.
  • Tens: 0 + 1 + 1 = 2 — write 2.
  • Hundreds: nothing to add — write 3.

307 + 15 = 322

Second check: 322 − 307 = 15

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FAQ

What is 307 + 15?

307 + 15 = 322

How do you check that 307 + 15 = 322?

Subtract one addend from the sum: 322 − 15 = 307, and 322 − 307 = 15. Getting the other addend back means the sum is right.

How many carries are there in 307 + 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 + 307 the same as 307 + 15?

Yes. Addition is commutative, so both give 322; the column looks the same with either number on top.

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