Unit 6, Lesson 22
Applications of Expressions
Grade 7
Preparation
Lesson Narrative
In this culminating lesson, students look at several real-world situations that can be represented by an expression with a variable. First, students write expressions to represent two different methods for performing a real-world calculation. They use the expressions to show why the two methods are equivalent. Then students are presented with two different coupons to a store (a 20% off coupon and a \$30 off coupon). They apply their understanding of expressions, equations, and inequalities to decide in which order the coupons should be applied to save more money on a purchase. As students write expressions to represent and compare the different discounts, they are reasoning abstractly and quantitatively (MP2).
- Determine which order for applying multiple coupons gives the better discount and explain (orally and in writing) the reasoning.
- Justify (orally, in writing, and using other representations) that two different sequences of calculations give the same result.
- Let’s use expressions to solve problems.
Required Preparation
None