Lesson 10

What Are Percentages?

Problem 1

What percentage of a dollar is the value of each coin combination?

  1. 4 dimes
  2. 1 nickel and 3 pennies
  3. 5 quarters and 1 dime

Solution

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Problem 2

  1. List three different combinations of coins, each with a value of 30% of a dollar.

  2. List two different combinations of coins, each with a value of 140% of a dollar.

Solution

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Problem 3

The United States government used to make coins of many different values. For each coin, state its worth as a percentage of $1.

A photo of five different coins. 

\(\frac12\) cent

3 cents

20 cents

$\(2 \frac12\)

$5

Solution

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Problem 4

Complete the double number to line show percentages of $50.

A double number line. Money, dollars. 

Solution

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Problem 5

Elena bought 8 tokens for $4.40. At this rate:

  1. How many tokens could she buy with $6.05?
  2. How much do 19 tokens cost?

Solution

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(From Unit 3, Lesson 9.)

Problem 6

A snail travels 10 cm in 4 minutes. At this rate:

  1. How long will it take the snail to travel 24 cm?
  2. How far does the snail travel in 6 minutes?

Solution

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(From Unit 3, Lesson 8.)

Problem 7

  1. 3 tacos cost $18. Complete the table to show the cost of 4, 5, and 6 tacos at the same rate.

    number of tacos cost in dollars rate in dollars per taco
    3 18
    4
    5
    6
  2. If you buy \(t\) tacos for \(c\) dollars, what is the unit rate?

Solution

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(From Unit 3, Lesson 7.)