Addition with Regrouping: 172 + 128

Addition with Regrouping Calculator
First addend
Second addend

What is 172 + 128?

Answer

172 + 128 =
300

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

172 + 128 in a column. Carries are the small circled digits above the columns.
1carry1carry
1 7 2
+128
300

Column by column: 172 + 128

  • Ones: 2 + 8 = 10 — write 0, carry 1.
  • Tens: 7 + 2 + 1 = 10 — write 0, carry 1.
  • Hundreds: 1 + 1 + 1 = 3 — write 3.

172 + 128 = 300

Second check: 300 − 172 = 128

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128 + 128256
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172 + 128300
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256 + 128384
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291 + 128419
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389 + 128517
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427 + 128555
453 + 128581

FAQ

What is 172 + 128?

172 + 128 = 300

How do you check that 172 + 128 = 300?

Subtract one addend from the sum: 300 − 128 = 172, and 300 − 172 = 128. Getting the other addend back means the sum is right.

How many carries are there in 172 + 128?

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 128 + 172 the same as 172 + 128?

Yes. Addition is commutative, so both give 300; the column looks the same with either number on top.

See Also