(3/10) + (1/4) = (6/20) + (5/20) = 11/20
0.3 + 0.25 = 0.55
11/20 = 0.55
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That depends what the question is. Do you want to add, subtract, multiply, divide, compare, or what?
1/10 + 1/5 =3/10. This is because, to add or subtract fractions, you must get them to have a common denominator. You can then convert 1/5 to 2/10 so that it shares a common denominator with the fraction 1/10. You then add the numerators, and 1+2=3, therefore your sum of the two fractions is 3/10, or 3 over 10.
9/10 * 1/3 = 3/10
3/5 - 1/10 --> 6/10 - 1/10 = 5/10 = 1/2.
1/4 - 3/10 = -1/20