In order to multiply two fractions, the fractions must have the same denominator. If the denominator of the fractions do not match, you must find the least common multiple between them. In this problem, the fractions do have a matching denominator so it becomes very easy. All you have to do is multiply the numerators by each other and the denominators by each other. The product of the numerators becomes the numerator of the answer and the product of the denominators becomes the denominator of the answer. In this case the two numerators to be multiplied are 5 and 1, while the two denominators to be multiplied are 9 and 9. The product of 5*1 is 5 and the product of 9*9 is 81. Therefore, the answer to this question would be 5/81.
