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Answer 1 · 2017-02-02T10:57:49

You make them have the same denominators

If you have a fraction, you can multiply the top and the bottom by the same number and the fraction remains the same.

Ex: $4/9 = (4*2)/(9*2) = 8/18$

So you can make sure that the denominators are equal by finding the "least common multiple" and making that the denominator of both fractions.

Ex: $4/9 + 1/6$

The least common multiple of the denominators 9 and 6 is 18 so:

$=(4*2)/(9*2)+(1*3)/(6*3)$

$=(8)/(18)+(3)/(18)$

$=(11)/(18)$