In this lesson, students begin interpreting and evaluating expressions with parentheses. They will write an expression to match a tape diagram. For example, a tape diagram that represents "9+11" is divided into 4 units with a question mark on 3 of the 4 units would be 3/4 x (9+11). Then students will write an expression given the word form. For example, "the product of 4 and 2, divided by 3" is written as (4x2) ÷3.