SOLUTION: Hi, I'm trying to help my son with this problem. My answer was 23/30 is that correct? Simplify: 2/3 +3/10 -2/5 2/3 + 3/10 = 11/30 then that minus 2/5? When I did it on an on

Question 258846: Hi, I'm trying to help my son with this problem. My answer was 23/30 is that correct?
Simplify: 2/3 +3/10 -2/5
2/3 + 3/10 = 11/30 then that minus 2/5? When I did it on an online math calculator, it said the answer is 17/30. I don't understand how that can be?
Thanks for your help! :)
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Whenever you have fractions, you need a common denominator.
In this case 30 will work. It's also the least common denominator.
Convert each to a fraction with a denominator of 30.

So then

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