Free worksheets for writing expressions with variables - Homeschool Math 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 expression to match that.