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Identify Equivalent Ratios

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New York State Common Core Math Module 1, Grade 6, Lesson 4

Videos and solutions to help Grade 6 students learn about equivalent ratios.

Lesson 4 Student Outcomes

• Given a ratio, students identify equivalent ratios. Students use tape diagrams and the description of equivalent ratios to determine if two ratios are equivalent.
• Students relate the positive number, c, in the description of equivalent ratios to the tape diagrams they have been using to find equivalent ratios.

Lesson 4 Summary

• Two ratios and are equivalent ratios if there is a positive number, c, such that C = cA and D = cB.
• Ratios are equivalent if there is a positive number that can be multiplied by both quantities in one ratio to equal the corresponding quantities in the second ratio.
• This description can be used to determine whether two ratios are equivalent.

Lesson 4 Example 1

The morning announcements said that two out of every seven 6th graders in the school have an overdue library book. Jasmine said, “That would mean 24 of us have overdue books!” Grace argued, “No way. That is way too high.” How can you determine who is right?

Lesson 4 Exercise 1

Decide whether or not each of the following pairs of ratios is equivalent.
• If the ratios are not equivalent, find a ratio that is equivalent to the first ratio.
• If the ratios are equivalent, identify the positive number, c, that could be used to multiply each number of the first ratio by in order to get the numbers for the second ratio.
a. 6:11 and 42:88
b. 0:5 and 0:20

Lesson 4 Exercise 2

In a bag of mixed walnuts and cashews, the ratio of number of walnuts to number of cashews is 5:6. Determine the amount of walnuts that are in the bag if there are 54 cashews. Use a tape diagram to support your work. Justify your answer by showing that the new ratio you created of number of walnuts to number of cashews is equivalent to 5:6.

Problem Set
1. Use diagrams or the description of equivalent ratios to show that the ratios 2:3, 4:6, and 8:12 are equivalent.

2. Prove that 3:8 is equivalent to 12:32.
a. Use diagrams to support your answer.
b. Use the description of equivalent ratios to support your answer.

3. The ratio of Isabella’s money to Shane’s money is 3:11. If Isabella has $33, how much money do Shane and Isabella have together? Use diagrams to illustrate your answer. Lesson 4 Word Problem

Prove that 4/9 is equivalent to 16/36 using:
1) Tape Diagrams
2) Equal Fractions
3) Description of Equivalent Ratios


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