Addition with Regrouping: 172 + 63

Addition with Regrouping Calculator
First addend
Second addend

What is 172 + 63?

Answer

172 + 63 =
235

With regrouping: 1 carry — into the hundreds

172 + 63 in a column. Carries are the small circled digits above the columns.
1carry
1 7 2
+63
235

Column by column: 172 + 63

  • Ones: 2 + 3 = 5 — write 5.
  • Tens: 7 + 6 = 13 — write 3, carry 1.
  • Hundreds: 1 + 1 = 2 — write 2.

172 + 63 = 235

Second check: 235 − 172 = 63

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FAQ

What is 172 + 63?

172 + 63 = 235

How do you check that 172 + 63 = 235?

Subtract one addend from the sum: 235 − 63 = 172, and 235 − 172 = 63. Getting the other addend back means the sum is right.

How many carries are there in 172 + 63?

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 63 + 172 the same as 172 + 63?

Yes. Addition is commutative, so both give 235; the column looks the same with either number on top.