if you mean 9/10 + 3/5 then multiply 3/5's numerator and denominator to get 6/10, which you can add to 9/10 to get 15/10, or 3/2. 1 1/2 if you need mixed numbers.
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3/5 = 6/10 9/10 - 6/10 = 3/10
The least common denominator of 9 tenths and one forty fifths is 10.
It is: -3/5 divided by 9/10 = -2/3
If you mean 3/5 times 3/10 then it is 9/50