6th grade math worksheets. 6th grade math worksheets, PDF printables to practice skills on math topics learnt in grade 6.These worksheets were created with teachers, homeschool parents and sixth graders in mind. The simplicity of the Pythagorean Theorem worksheet is the best thing about it. What is the Pythagorean Theorem? Formulated in the 6th Century BC by Greek Philosopher and mathematician Pythagoras of Samos, Pythagorean Theorem is a mathematic equation used for a variety of purposes.