Lesson 4

Task #5: Swimming Pool

Spiral pg. 79Binder pg. 10

•You want to build a square swimming pool in your backyard. Lets denote the length of each side of the swimming pool (measured in feet). You plan to surround the pool by square border tiles, each of which is one foot by one foot (see figure).

• A teacher asks her students to find an expression for the number of tiles needed to surround such a square pool, and sees the following responses from her students:• 4(s+1)• s2

• 4s+4• 2s+2(s+2)• 4s• Is each mathematical model correct or incorrect? How do you

know?

Smartphones/University Pop.

Spiral pg. 80-81Binder pg. 11-12

In your Group1. You will be creating a poster on the next

task.

2. Your group will have 25 minutes to create the poster, and be ready to present on the topic.

3. You can show numeric or verbal proof of this.

Poster must include:

1. Brief summary of the problem.2. Each pair of expressions.3. The proof for why which expression is larger

for each pair.a)Again the proof could either be a numerical

example.b)Or verbal reasoning.

4. Must be neat and organized.

Independent Practice Spiral pg. 82/Binder pg. 13