Printable algebra and pre-algebra math worksheets for math grades 6 and 7. Printable algebra and pre-algebra math worksheets for math grades 6 and 7. Pre-Algebra Crosswords These are our Pre-Algebra Crosswords (pre) algebra worksheets for primary math class. Click on the previews to go to download page. Add and Subtract (level 6) Add and Subtract (level 6) Multiply and Divide (level 6) Multiply and Divide (level 6)