Addition with Regrouping: 389 + 128

Addition with Regrouping Calculator
First addend
Second addend

What is 389 + 128?

Answer

389 + 128 =
517

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

389 + 128 in a column. Carries are the small circled digits above the columns.
1carry1carry
3 8 9
+128
517

Column by column: 389 + 128

  • Ones: 9 + 8 = 17 — write 7, carry 1.
  • Tens: 8 + 2 + 1 = 11 — write 1, carry 1.
  • Hundreds: 3 + 1 + 1 = 5 — write 5.

389 + 128 = 517

Second check: 517 − 389 = 128

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Column additions with 128

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214 + 128342
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256 + 128384
268 + 128396
291 + 128419
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325 + 128453
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354 + 128482
376 + 128504
389 + 128517
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427 + 128555
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468 + 128596
485 + 128613
519 + 128647
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564 + 128692
578 + 128706

FAQ

What is 389 + 128?

389 + 128 = 517

How do you check that 389 + 128 = 517?

Subtract one addend from the sum: 517 − 128 = 389, and 517 − 389 = 128. Getting the other addend back means the sum is right.

How many carries are there in 389 + 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 + 389 the same as 389 + 128?

Yes. Addition is commutative, so both give 517; the column looks the same with either number on top.

See Also