1. Pre-Algebra
Ratios

2. What Are You Learning?
I CAN find ratios.

3. Why Do You Need To Know This?
Ratios are important because they are used to compare different quantities.
Ratios can be used in a variety of ways and can be found many places in the real world.

4. What is a ratio?
What are equivalent ratios?
Give an example of a ratio.
Give an example of equivalent ratios.
Questions You May Have…
Why Is It Important to Have Ratios?

5. Vocabulary Ratio—a comparison of two quantities by division.
2 to 3 2:3 2/3
Equivalent Ratios—two ratios that have the same value.

6. Determine whether the two ratios are equivalent.
6:8 and 36:48
3/8 and 6/12
35 students:5 adults and 14 students:2 adults
12:15 and 32:40

7. Group Work
You are going to work in groups to create your own ratios of items found in the classroom.

8. Write each ratio in simplest form.
25 to 10
6:18
9 to 12
27:15
8 to 56
30 to 9