11/15+7/10-2/5 how do I do this problem?
11/15+7/10-2/5
First, you need to find the common denominator. Since 30 is the smallest number divisible by 15, 30, and 5, then 30 is the common denominator.
11/15 = 22/30
7/10 = 21/30
2/5 = 12/30
22/30 + 21/30 = 43/30
43/30 - 12/30 = 31/30 = 1 1/30