Addition with Regrouping: 172 + 149

Addition with Regrouping Calculator
First addend
Second addend

What is 172 + 149?

Answer

172 + 149 =
321

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

172 + 149 in a column. Carries are the small circled digits above the columns.
1carry1carry
1 7 2
+149
321

Column by column: 172 + 149

  • Ones: 2 + 9 = 11 — write 1, carry 1.
  • Tens: 7 + 4 + 1 = 12 — write 2, carry 1.
  • Hundreds: 1 + 1 + 1 = 3 — write 3.

172 + 149 = 321

Second check: 321 − 172 = 149

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149 + 149298
172 + 149321
187 + 149336
203 + 149352
214 + 149363
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251 + 149400
256 + 149405
268 + 149417
291 + 149440
307 + 149456
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348 + 149497
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376 + 149525
389 + 149538
402 + 149551
427 + 149576
451 + 149600

FAQ

What is 172 + 149?

172 + 149 = 321

How do you check that 172 + 149 = 321?

Subtract one addend from the sum: 321 − 149 = 172, and 321 − 172 = 149. Getting the other addend back means the sum is right.

How many carries are there in 172 + 149?

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 149 + 172 the same as 172 + 149?

Yes. Addition is commutative, so both give 321; the column looks the same with either number on top.

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