The easy way to add and subtract fractions.
Multiply crosswise and add to get the top of the answer:
2 x 5 = 10 and 1 x 3 = 3. Then 10 + 3 = 13.
The bottom of the fraction is just 3 x 5 = 15.
You multiply the bottom number together.
So: 
Subtracting is just as easy: multiply crosswise as before, but the subtract:
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