The easiest way is to find the 'common denominator' then add the numerators:
1. Finding a common denominatorThe two denominators are 7 and 9, and we need to find the first number that is a multiple of both. Multiplying the two always gives you one (but might not be the lowest number that does), in this case 7*9=63 . 2. Convert both fractions to use the new denominatorTo convert we multiply both sides of each fraction until we get to the new denominator:The answer is 62/63.
This fraction cannot be simplified, but in other cases like this you should to get a simpler answer.
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