60 pages total. 30 worksheets followed by 30 answer keys. Diamonds or X's are great exercises for factoring and mastering integer operations. I like to use these worksheets throughout the school year to maintain their skills and to get an early start on factoring quadratics. The top of the diamond is the product, the bottom is the sum and the left and right sides are the factors. The preview download comes with one worksheet page followed by the answer key. For example, I tell my students, "what are two factors of -12 that add up to 4." The answer is 6 and -2.key. For example, I tell my students, "what are two factors of -12 that add up to 4." The answer is 6 and -2.