Question

Obtain an estimate for the following computation by rounding the numbers so that the resulting arithmetic can easily

be performed by hand or in your head. Then, use a calculator to perform the computation. How reasonable is your
estimate when compared to the actual answer?
348 +598
Round the two numbers to the nearest ten. An estimate of the sum is
an example
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Answer 1

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Answer 2

Answer: The answer to the computation 348 + 598 is 946.

Explanation:

To obtain an estimate for the computation 348 + 598, we can round the two numbers to the nearest ten.

348 rounded to the nearest ten is 350

598 rounded to the nearest ten is 600

So, our estimate for the sum of 348 + 598 is 350 + 600 = 950

Using a calculator, the actual computation is 348 + 598 = 946

Our estimate of 950 is 4 more than the actual answer of 946. This means that our estimate is slightly higher than the actual answer. This is not a big difference and it is reasonable as the numbers are rounded to nearest 10.