Free worksheets for writing expressions with variables Create free worksheets for writing simple expressions with variables (pre-algebra / algebra 1 / grades 6-9, either as PDF or html files. The problems give the student the expression in words, such as the quotient of 7t and 5, the difference of x and 8, divided by 2, or the quantity 8 plus 2t, cubed, and ask the student to write a mathematical ...