Seudónimo Seudónimo
  • 19-05-2016
  • Mathematics
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Estimate the sum of 21+17.

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Zie123
Zie123 Zie123
  • 19-05-2016
40 Is The Sum Of 21+17.
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ossashi
ossashi ossashi
  • 19-05-2016
When estimating sums, you need to round to get to the answer.

So in the problem:

21+17 = ?

I round 21 to 20.

I round 17 to 20.

So know, the problem is:

20+20

The answer to 20 + 20 equals 40.

The answer is 40.

Answer Link

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