Addition with Regrouping: 647 + 128

Addition with Regrouping Calculator
First addend
Second addend

What is 647 + 128?

Answer

647 + 128 =
775

With regrouping: 1 carry — into the tens

647 + 128 in a column. Carries are the small circled digits above the columns.
1carry
6 4 7
+128
775

Column by column: 647 + 128

  • Ones: 7 + 8 = 15 — write 5, carry 1.
  • Tens: 4 + 2 + 1 = 7 — write 7.
  • Hundreds: 6 + 1 = 7 — write 7.

647 + 128 = 775

Second check: 775 − 647 = 128

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FAQ

What is 647 + 128?

647 + 128 = 775

How do you check that 647 + 128 = 775?

Subtract one addend from the sum: 775 − 128 = 647, and 775 − 647 = 128. Getting the other addend back means the sum is right.

How many carries are there in 647 + 128?

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 128 + 647 the same as 647 + 128?

Yes. Addition is commutative, so both give 775; the column looks the same with either number on top.

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