Well, darling, 7 tenths is the same as 10 fifteenths, so you're basically adding 10 fifteenths to 4 fifteenths, which gives you 14 fifteenths. So the answer is 14/15. Math doesn't have to be boring, honey!
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7/10 + 4/15 = 42/60 + 16/60 = 58/60 = 29/30 . You can simply plug the problem into your calculator. Otherwise, find a common denominator as shown below and solve. The answer is 29/30.
4/9 plus 7/15 = 41/45 in its simplest form
7 and 8 fifteenths
9/10 + 4/15 is same as 27/30 + 8/30 = 35/30 = 7/6 = 1 1/6
7/15 or seven fifteenths
(4 / 5) - (7 / 15) = 0.333333333