Lesson 14
Solving Percentage Problems
Problem 1
For each problem, explain or show your reasoning.
 160 is what percentage of 40?
 40 is 160% of what number?
 What number is 40% of 160?
Solution
For access, consult one of our IM Certified Partners.
Problem 2
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.
Solution
For access, consult one of our IM Certified Partners.
Problem 3
The original price of a scarf was $16. During a storeclosing sale, a shopper saved $12 on the scarf. What percentage discount did she receive? Explain or show your reasoning.
Solution
For access, consult one of our IM Certified Partners.
Problem 4
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
Solution
For access, consult one of our IM Certified Partners.
Problem 5
An ant travels at a constant rate of 30 cm every 2 minutes.
 At what pace does the ant travel per centimeter?
 At what speed does the ant travel per minute?
Solution
For access, consult one of our IM Certified Partners.
(From Unit 3, Lesson 8.)Problem 6
Is 3\(\frac{1}{2}\) cups more or less than 1 liter? Explain or show your reasoning. (Note: 1 cup \(\approx\) 236.6 milliliters)
Solution
For access, consult one of our IM Certified Partners.
(From Unit 3, Lesson 4.)Problem 7
Name a unit of measurement that is about the same size as each object.

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

The thickness of a fingernail is about 1 _____________.

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

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

The thickness of a picture book is about 1 _____________.

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

The volume of a flower vase is about 1 _____________.

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

The volume of a melon is about 1 _____________.

The length of a piece of printer paper is about 1 _____________.
Solution
For access, consult one of our IM Certified Partners.
(From Unit 3, Lesson 2.)