Personally I would say the easiest way is to convert the fraction's into decimal and then add the results.
For example
1/2 + 1/2 + 1/4 = 0.5+0.5+0.25 = 1.25 (1 and a quarter)
1/8 + 1/4 = 0.125 + 0.25 = 0.375 (just over a third)
Although this doesn't give you a true fraction result it will give you a measurement.
I'm sure someone will know how to do proper fractional addition out there or a library may be of use. I may be wrong but i think that to convert back into a fraction you would probably need a logarithmic (reference) table of some kind to calculate all or some of the possible values. Good luck with finding out!
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The process is still that of addition.
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Yes, the set of rational numbers is closed under addition.
You add the fractions together. More detailed steps depend on the exact nature of the problem.
Convert to a Fraction 33 1/3%. Convert the percentage to a fraction by placing the expression over . Percentage means 'out of '. Reduce the fraction. Tap for more steps... Convert to an improper fraction. Tap for more steps... A mixed number is an addition of its whole and fractional parts. Add and . Tap for more steps... To write as a fraction with a common denominator, multiply by .