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You have to find a common denominator for example 2/4 + 4/8 ,so you have to multiply the 4 x 2 which will make the denominator 8
So the you multiply 2 x 2 which is 4
So your new problem is 4/8+4/8
The problem is 4/8+4/8 don't add the denominator so your answer is 8/8 witch is also 1 whole