Similar fractions:
5/10 + 3/10 = 8/10 or 4/5
6/9 - 3/9 = 3/9 or 1/3
Dissimilar
10/20 + 5/10 = 10/20 (find lcd, divide, and multiply) 10/20 + 10/20 = 20/20 or 20
20/50 - 3/10 = 20/50 and 15/20 (find lcd, divide, and multiply) 20/50 - 15/50 = 5/50 or 5/10
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