what does ( 2/5)(5/6) mean?
(2/5)(5/6)-(5/9)(3/10)
It means that you are multiplying the fraction 2/5 by the fraction 5/6
When you are multiplying fractions, you multiply the numerators to get
the new numerator, and multiply the denominators to get the new denominator.
In this example, multiply the 2 in 2/5 by the 5 in 5/6 to get 10. Then, multiply
the 5 in 2/5 by the 6 in 5/6 to get 30. The result is 10/30.
Using the same method, (5/9) times (3/10) = 15/90.
To subtract, the denominators have to be the same. 15/90 is 5/30.
10/30 - 5/30 = 5/30
5/30 = 1/6
That's more than you asked for, but might as well run through all of it.