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Yes, you multiply the numerator by the numerator, and the denominator by the denominator, and then reduce the fraction. For instance:One half of two fifths is1/2 x 2/5 = 2/10 which, when reduced, equals 1/5. Logically, if you have half of two fifths, you have one fifth. If you had half of four fifths, you would have two fifths, and so on.
the least common denominator of three fifths and two fifteenths and one sixth is 30. you multiply 15 by two, 6 by five, and 3 by ten.
15 and two thirds plus four fifths = one two fiftenth
the denominator of one half is 2
To add one third and one half, you'll want a common denominator. In this case, it's 6.