Your common denominator is 10, so that is 2 8/10 + 3 5/10 = 5 13/10, which reduces to 6 3/10.
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2 fourths times four fifths is 2 fifths.
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.
One half is bigger than two fifths because two fifths just before 2.5 fifths which is half.
No because 1/2 = 0.5 but 4/5 = 0.8
(1/2) x (3/5) = 3/10