Name:    Try It Out -- Chapter 5, Lesson 7: Communicating about Measurement

Matching

A grade 5 student asks you to explain how to calculate the perimeter and then the area of a triangle. Each side of the triangle is 3 cm long and the height of the triangle is 3.5 cm. Order the steps you would take to solve the problem.

 A. I calculate the area by using the formula for a triangle (b x h ¸ 2) to get 5.25 cm2. B. The perimeter is 9 cm, and the area is 5.25 cm2. C. I measure the perimeter by adding the length of all the sides together to get 9 cm.

1.

What is the first step?

2.

What is the second step?

3.

What is the final step?

Palak wants to buy a pool cover for his 3 m x 5 m swimming pool. He also needs a border around the pool to tack down the cover.  The cost of the blanket is \$20.00 per square metre. The cost of the border is \$10.00 per metre. Order the steps he will take to find the total cost.

 A. He measures the perimeter by adding all the sides of the pool to get 16 m. He calculates the area of the pool by using the formula b x h. So 3 m x 5 m is 15 m2. B. The total cost of the blanket and border is \$460.00. C. The border will cost \$10.00 x 16 m or \$160.00, and the blanket will cost \$20.00 x 15 m2, or \$ 300.00.

4.

What is the first step?

5.

What is the second step?

6.

What is the final step?

Multiple Choice
Choose the correct answer.

7.

Francois wants to put boards around his hockey rink. What will he measure to find the number of boards needed?
 A. perimeter B. area

8.

Jane Anne needs to fertilize her lawn. One bag of fertilizer covers 5 m2. What will she measure to find the number of bags of fertilizer she will need for the entire lawn?
 A. perimeter B. area