Addition with Regrouping: 129 + 71

Addition with Regrouping Calculator
First addend
Second addend

What is 129 + 71?

Answer

129 + 71 =
200

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

129 + 71 in a column. Carries are the small circled digits above the columns.
1carry1carry
1 2 9
+71
200

Column by column: 129 + 71

  • Ones: 9 + 1 = 10 — write 0, carry 1.
  • Tens: 2 + 7 + 1 = 10 — write 0, carry 1.
  • Hundreds: 1 + 1 = 2 — write 2.

129 + 71 = 200

Second check: 200 − 129 = 71

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FAQ

What is 129 + 71?

129 + 71 = 200

How do you check that 129 + 71 = 200?

Subtract one addend from the sum: 200 − 71 = 129, and 200 − 129 = 71. Getting the other addend back means the sum is right.

How many carries are there in 129 + 71?

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 71 + 129 the same as 129 + 71?

Yes. Addition is commutative, so both give 200; the column looks the same with either number on top.

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