Addition with Regrouping: 172 + 172

Addition with Regrouping Calculator
First addend
Second addend

What is 172 + 172?

Answer

172 + 172 =
344

With regrouping: 1 carry — into the hundreds

172 + 172 in a column. Carries are the small circled digits above the columns.
1carry
1 7 2
+172
344

Column by column: 172 + 172

  • Ones: 2 + 2 = 4 — write 4.
  • Tens: 7 + 7 = 14 — write 4, carry 1.
  • Hundreds: 1 + 1 + 1 = 3 — write 3.

172 + 172 = 344

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FAQ

What is 172 + 172?

172 + 172 = 344

How do you check that 172 + 172 = 344?

Subtract one addend from the sum: 344 − 172 = 172. Getting the other addend back means the sum is right.

How many carries are there in 172 + 172?

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.