Lesson 23: Practice Problems

Problem 1

Complete each statement.

  1. 20% of 60 is

  2. 25% of is 6

  3. % of 100 is 14

  4. 50% of 90 is

  5. 10% of is 7

  6. 30% of 70 is

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.

Problem 3

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.

Problem 4

  1. To find 40% of 75, Priya calculates . Does her calculation give the correct value for 40% of 75? Explain or show how you know.

  2. If represents a number, does always represent 40% of that number? Explain your reasoning.

Problem 5

Han spent 75 minutes practicing the piano over the weekend. For each question, explain or show your reasoning.

  1. Priya practiced the violin for 152% as much time as Han practiced the piano. How long did she practice?

  2. Tyler practiced the clarinet for 64% as much time as Han practiced the piano. How long did he practice?

Problem 6

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?