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Change them to improper fractions and double them.
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).
You press 2nd on a a ti 84 calculator and go to math than mixed and it should work :D
12 1/20 or mixed would be 241/20
It is a process by which the product of mixed fractions is calculated.