Addition with Regrouping: 485 + 315

Addition with Regrouping Calculator
First addend
Second addend

What is 485 + 315?

Answer

485 + 315 =
800

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

485 + 315 in a column. Carries are the small circled digits above the columns.
1carry1carry
4 8 5
+315
800

Column by column: 485 + 315

  • Ones: 5 + 5 = 10 — write 0, carry 1.
  • Tens: 8 + 1 + 1 = 10 — write 0, carry 1.
  • Hundreds: 4 + 3 + 1 = 8 — write 8.

485 + 315 = 800

Second check: 800 − 485 = 315

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FAQ

What is 485 + 315?

485 + 315 = 800

How do you check that 485 + 315 = 800?

Subtract one addend from the sum: 800 − 315 = 485, and 800 − 485 = 315. Getting the other addend back means the sum is right.

How many carries are there in 485 + 315?

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 315 + 485 the same as 485 + 315?

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

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