1. Ratios and Proportions

3. How do you write equivalent ratios?

4. To check if 2 ratios are proportional…you can use cross products or cross multiplying = Is 2 x 10 equal to 4 x 5? If yes, you have a proportion!

5. You try it! Is this a proportion? =

6. You can also use “scale factor” to see if two ratios form a proportion = x 3 = x 3 = Since 3 x 3 = 9 and 8 x 3 = 24, these ratios do form a proportion! 3 is called the “scale factor”.

7. You Try it! Is this a proportion? =

8. You Try it! Is this a proportion? =