This Eco-friendly product allows teachers to print out addition, subtraction, multiplication, and division practice sheets one time for multiple use. Each practice sheet contains 40 math equations, which can yield 120 different questions. For example, the equation 3 + 4 = 7 is printed. Different variations of this question would be 3 + __ = 7, ___ + 4 = 7, or 3 + 4 = ___. You decide which part of the equation you want the student to find. These sheets are to be used in Sheet Protectors with D