Task# All, Some, or None?

Illustrative MathematicsVaries

In earlier grades, students write and evaluate numerical expressions and equations to represent operations with numbers. Their experience with the meaning of addition, subtraction, multiplication, and division as well as the properties of operations prepares them to understand algebra as 'generalized arithmetic.' Since numerical expressions can only have one value, an equation with only numbers is either true or false, depending on whether the expression on the left has the same value as the expression on the right. On the other hand, there is an important distinction between being equal and being equivalent for algebraic expressions.