This self checking worksheet takes the student through 5 problems. The students are to take a rational fraction such as (-5x^2-6x+48)/(2x^3+7x^2+4x-4) and decompose it into three separate fractions: 7/(2x-1) - 6/(x+2) - 8/(x+2)^2. The students are given the factorization of the denominator. The process involves lots and lots of substitution. When finished, the students will discover the punch line to a riddle.