Math CentralQuandaries & Queries


Question from Blaine, a student:

Is it possible to put a repeating decimal number into a calculator to solve a problem?

EX: Write 39.3939... as a fraction.

Hi Blaine,

Your calculator represents numbers with a finite number of decimal places. Mine shows 11 places after the decimal. So your calculator can't represent the repeating decimal 39.3939... exactly. Look at the response we gave to Lil that shows how to write a repeating decimal as a common fraction.

If you need more help write back,

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