Addition with Regrouping: 307 + 203

Addition with Regrouping Calculator
First addend
Second addend

What is 307 + 203?

Answer

307 + 203 =
510

With regrouping: 1 carry — into the tens

307 + 203 in a column. Carries are the small circled digits above the columns.
1carry
3 0 7
+203
510

Column by column: 307 + 203

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

307 + 203 = 510

Second check: 510 − 307 = 203

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FAQ

What is 307 + 203?

307 + 203 = 510

How do you check that 307 + 203 = 510?

Subtract one addend from the sum: 510 − 203 = 307, and 510 − 307 = 203. Getting the other addend back means the sum is right.

How many carries are there in 307 + 203?

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 203 + 307 the same as 307 + 203?

Yes. Addition is commutative, so both give 510; the column looks the same with either number on top.

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