Addition with Regrouping: 578 + 203

Addition with Regrouping Calculator
First addend
Second addend

What is 578 + 203?

Answer

578 + 203 =
781

With regrouping: 1 carry — into the tens

578 + 203 in a column. Carries are the small circled digits above the columns.
1carry
5 7 8
+203
781

Column by column: 578 + 203

  • Ones: 8 + 3 = 11 — write 1, carry 1.
  • Tens: 7 + 0 + 1 = 8 — write 8.
  • Hundreds: 5 + 2 = 7 — write 7.

578 + 203 = 781

Second check: 781 − 578 = 203

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FAQ

What is 578 + 203?

578 + 203 = 781

How do you check that 578 + 203 = 781?

Subtract one addend from the sum: 781 − 203 = 578, and 781 − 578 = 203. Getting the other addend back means the sum is right.

How many carries are there in 578 + 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 + 578 the same as 578 + 203?

Yes. Addition is commutative, so both give 781; the column looks the same with either number on top.

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