In order to add a fraction to a variable the fraction must be converted to decimal as computers cannot understand fractions, thats why they have floating points. On the other hand you could produce an answer in decimal and then convert it into a fraction afterwards but it would be overly complicated for a program to do this. I suggest if you are seriously into this somewhat eccentric behaviour you should try the program Mathematica from Wolfram research which is very expensive.
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adding fractions is like adding a WHOLE lot of parts of numbers
Ensure that the denominators are the same when adding or subtracting fractions.
When adding or subtracting fractions their denominators must be the same
Mixed numbers can be converted to improper fractions. Then, it is exactly the same as adding proper ones.
Before adding or subtracting two fractions they are converted into like fractions. Explain with examples why this is necessary.