Free Worksheets for Grades 6, 7, 8 — Mashup Math Free Math Worksheets for Sixth, Seventh, Eighth, and Ninth Grade (w/ Answer Keys) The following printable math worksheets for 6th, 7th, 8th, and 9th grade include a complete answer key. Click any of the links below to download your worksheet as an easy-to-print PDF file. Topic: Decimals, Fractions and Mixed Numbers Simplifying Fractions