If I understand this right, you want to know how to convert a fraction into a decimal with the aid of a calculator. This is usually done by pressing the fraction button on your calculator which changes it from a fraction to a decimal and vice versa.
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Based on the decimal fraction part it looks like this is a rounded answer to division by three. If so, multiply the whole thing by three on a calculator, round, then convert to a fraction using three for the denominator. Using Windows 7 calculator, 71.6666667 * 3 = 215.0000001. You are probably looking at 215/3 for the answer as an improper fraction, or 71 2/3 as a proper fraction.
Say for example the fraction you wanted to convert was 3 fifths or 3/5. Then you type into your calculator 3 divided by 5. This would give you 0.6 and that is the decimal version!
Divide the numerator by the denominator
You should be familiar with long division involving decimals
5/8 = 5 divided by 8 = 0.625