To multiply two fractions, you can follow these steps:

1. Multiply the numerators (top numbers) of the fractions together.
2. Multiply the denominators (bottom numbers) of the fractions together.
3. Simplify the resulting fraction, if possible.

For example, to multiply 2/3 by 5/8:

1. 2 x 5 = 10
2. 3 x 8 = 24
3. The resulting fraction is 10/24, which can be simplified by dividing both the numerator and denominator by their greatest common factor, which in this case is 2. This gives 5/12 as the final answer.

So 2/3 x 5/8 = 5/12.