A fraction can be turned into a decimal figure. Divide the bottom into the top to get your decimal figure. Then work in decimals.
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A calculator can convert numbers that appear as decimals into numbers that appear as fractions. Fractions are generally considered more easy to use then decimals.
The same way you calculate averages with whole numbers: Add up all the fractions and divide by the number of fractions there are.
How can you calculate the square root of 1.8E-5 without a calculator?
Check the manual of your specific calculator. What I have seen is usually something like the following: The calculator tends to automatically show fractions as mixed fractions. The calculator has a "fraction" key, often labelled ab/c. Pressing the "shift" key (or some similar key for "extra functions") followed by the fraction key will often to the desired conversion in the other way (from mixed to improper).
Divide the denominator into the numerator. Multiply the answer by 100.