Each exponent (the smaller number to the top right of the 10) represents another 10 by which to multiply.
(10)(10)(10)(10) = 10,000
What is the exponent in this problem?
That will be the number of fives to multiply together.
(5)(5)(5) = 125
Remember, when multiplying fractions, you simply multiplythe numerators together and denominators together.
The product of three negative numbers is a negative number.