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# Calculating and Rounding Numbers

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Mathematicians need to know that not all numbers are rational. We approximate irrational number with rational numbers. That is why a calculator may be misleading. This task give learners an opportunity to see how rounding a number and then multiplying it is not the same as multiplying a number and rounding it.

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##### Pros

- Shows the limits of calculators

##### Cons

- None

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