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Find the lowest common multiple of the denominators then multiply the top and bottom of the fractions to get this denominator.
so for example for:
1/3 + 1/2 the lowest common multiple is 6.
6 = 3 x 2
so 1/3 = 2x1/2x3 = 2/6
and 1/2 = 3x1/3x2 = 3/6
therefore 1/3 + 1/2 = 2/6 + 3/6 = 2+3/6 = 5/6
and it works for much bigger numbers too
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