Lesson 14

For each problem, explain or show your reasoning.

1. 160 is what percentage of 40?
2. 40 is 160% of what number?
3. What number is 40% of 160?

A store is having a 20%-off sale on all merchandise. If Mai buys one item and saves $13, what was the original price of her purchase? Explain or show your reasoning.

The original price of a scarf was $16. During a store-closing sale, a shopper saved $12 on the scarf. What percentage discount did she receive? Explain or show your reasoning.

Select all the expressions whose value is larger than 100.

120% of 100

50% of 150

150% of 50

20% of 800

200% of 30

500% of 400

1% of 1,000

An ant travels at a constant rate of 30 cm every 2 minutes.

1. At what pace does the ant travel per centimeter?
2. At what speed does the ant travel per minute?

Is 3\(\frac{1}{2}\) cups more or less than 1 liter? Explain or show your reasoning. (Note: 1 cup \(\approx\) 236.6 milliliters)

Name a unit of measurement that is about the same size as each object.

1. The distance of a doorknob from the floor is about 1 _____________.

2. The thickness of a fingernail is about 1 _____________.

3. The volume of a drop of honey is about 1 _____________.

4. The weight or mass of a pineapple is about 1 _____________.

5. The thickness of a picture book is about 1 _____________.

6. The weight or mass of a buffalo is about 1 _____________.

7. The volume of a flower vase is about 1 _____________.

8. The weight or mass of 20 staples is about 1 _____________.

9. The volume of a melon is about 1 _____________.

10. The length of a piece of printer paper is about 1 _____________.