Interpreting linear expressions

The topic  appears under the 7th Grade Math Mission. This exercise provides examples of some of subtleties in linear expressions and word problems.

Types of Problems
There is one type of problem in this exercise:


 * 1) Tell which of these expressions model which statement: This problem provides a chart, several expressions and some statements. The student is asked to select which mathematical expressions represent the corresponding English statements.Ile1.png

Strategies
Confidence with translation between mathematics and English can help to perform this exercise.
 * 1) Some of the problems use markup equations. The amount of a markup is p/100*the amount and the price after markup is (1+p)/100*the amount.
 * 2) Some of the problems use discount equations. The amount of a discount  is p/100*the amount and the price after discount is (1+p)/100*the amount.
 * 3) The commutative property is used on some problem to rewrite equivalent expressions. Remember that a+b=b+a.
 * 4) The "not represented" category is used often so be expecting it.