Free math worksheets - Homeschool Math WebPRE-made worksheets for various grade 6 math topics. Still randomly generated, but all you need to do is click on the links. ... For grades 6-8, pre-algebra, and algebra 1. Evaluate expressions. Worksheets for evaluating simple expressions with variables, when the value of the variable(s) are given. For grades 6-8, pre-algebra, and algebra 1.