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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.
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.
The usual method is to convert the fractions to equivalent fractions with a common denominator. Then you can simply compare the numerators. You can also convert each of the fractions to a decimal - this can easily be done with a calculator, simply divide the numerator by the denominator.
18.5. You should get a calculator that can do fractions or use wolframalpha.com