Addition with Regrouping: 427 + 389

Addition with Regrouping Calculator
First addend
Second addend

What is 427 + 389?

Answer

427 + 389 =
816

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

427 + 389 in a column. Carries are the small circled digits above the columns.
1carry1carry
4 2 7
+389
816

Column by column: 427 + 389

  • Ones: 7 + 9 = 16 — write 6, carry 1.
  • Tens: 2 + 8 + 1 = 11 — write 1, carry 1.
  • Hundreds: 4 + 3 + 1 = 8 — write 8.

427 + 389 = 816

Second check: 816 − 427 = 389

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FAQ

What is 427 + 389?

427 + 389 = 816

How do you check that 427 + 389 = 816?

Subtract one addend from the sum: 816 − 389 = 427, and 816 − 427 = 389. Getting the other addend back means the sum is right.

How many carries are there in 427 + 389?

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 389 + 427 the same as 427 + 389?

Yes. Addition is commutative, so both give 816; the column looks the same with either number on top.

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