Addition with Regrouping: 402 + 398

Addition with Regrouping Calculator
First addend
Second addend

What is 402 + 398?

Answer

402 + 398 =
800

With regrouping: 2 carries — into the tens and the hundreds

402 + 398 in a column. Carries are the small circled digits above the columns.
1carry1carry
4 0 2
+398
800

Column by column: 402 + 398

  • Ones: 2 + 8 = 10 — write 0, carry 1.
  • Tens: 0 + 9 + 1 = 10 — write 0, carry 1.
  • Hundreds: 4 + 3 + 1 = 8 — write 8.

402 + 398 = 800

Second check: 800 − 402 = 398

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FAQ

What is 402 + 398?

402 + 398 = 800

How do you check that 402 + 398 = 800?

Subtract one addend from the sum: 800 − 398 = 402, and 800 − 402 = 398. Getting the other addend back means the sum is right.

How many carries are there in 402 + 398?

2 carries: 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 398 + 402 the same as 402 + 398?

Yes. Addition is commutative, so both give 800; the column looks the same with either number on top.

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