Addition with Regrouping: 187 + 128

Addition with Regrouping Calculator
First addend
Second addend

What is 187 + 128?

Answer

187 + 128 =
315

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

187 + 128 in a column. Carries are the small circled digits above the columns.
1carry1carry
1 8 7
+128
315

Column by column: 187 + 128

  • Ones: 7 + 8 = 15 — write 5, carry 1.
  • Tens: 8 + 2 + 1 = 11 — write 1, carry 1.
  • Hundreds: 1 + 1 + 1 = 3 — write 3.

187 + 128 = 315

Second check: 315 − 187 = 128

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Column additions with 128

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128 + 128256
136 + 128264
149 + 128277
172 + 128300
187 + 128315
203 + 128331
214 + 128342
239 + 128367
256 + 128384
268 + 128396
291 + 128419
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325 + 128453
348 + 128476
354 + 128482
376 + 128504
389 + 128517
402 + 128530
427 + 128555
453 + 128581

FAQ

What is 187 + 128?

187 + 128 = 315

How do you check that 187 + 128 = 315?

Subtract one addend from the sum: 315 − 128 = 187, and 315 − 187 = 128. Getting the other addend back means the sum is right.

How many carries are there in 187 + 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 + 187 the same as 187 + 128?

Yes. Addition is commutative, so both give 315; the column looks the same with either number on top.

See Also