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