Addition with Regrouping: 427 + 203

Addition with Regrouping Calculator
First addend
Second addend

What is 427 + 203?

Answer

427 + 203 =
630

With regrouping: 1 carry — into the tens

427 + 203 in a column. Carries are the small circled digits above the columns.
1carry
4 2 7
+203
630

Column by column: 427 + 203

  • Ones: 7 + 3 = 10 — write 0, carry 1.
  • Tens: 2 + 0 + 1 = 3 — write 3.
  • Hundreds: 4 + 2 = 6 — write 6.

427 + 203 = 630

Second check: 630 − 427 = 203

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FAQ

What is 427 + 203?

427 + 203 = 630

How do you check that 427 + 203 = 630?

Subtract one addend from the sum: 630 − 203 = 427, and 630 − 427 = 203. Getting the other addend back means the sum is right.

How many carries are there in 427 + 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 + 427 the same as 427 + 203?

Yes. Addition is commutative, so both give 630; the column looks the same with either number on top.

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