Simply multiply the two denominators to get the resultant denominator, and be likewise with the two numerators.
2/3 x 4/5 = 8/15
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When multiplying 2 fractions, we multiply the two numerators together and the two denominators together.
Multiply the first two together and then multiply that total by the third.
It is the binary operation of multiplication which has two inputs, at least one of which comprises a mixed fraction: that is, a fraction which consists of an integer part and a part which is a proper fraction.
First you change them into improper fractions. Then you multiply the numerator and the denamanator straight across. ;)
To multiply two fractions, multiply the numerators together, then the denominators, then put the new numerator over the new denominator. Simplify if you can. To divide fractions, invert the second fraction and multiply as just described.