1. Proportions

2. Ratios and Proportions

3. Ratios and Proportions

4. Ratios and Proportions
Our Class Numbers
Girls _____ Boys _____ Total Students ____
What is the ratio of:
(Write the ratio 3 ways)
Girls to class _______ ________ _______
Boys to class _______ ________ _______
Girls to boys _______ ________ _______
Boys to girls _______ ________ _______

5. Ratios and Proportions
What is the ratio in simplest form of the number of circles to the number of triangles? Express the ratio 3 different ways.
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6. Ratios and Proportions
What is the ratio, in simplest form, of the number of squares to the total number of quadrilaterals? Express the ratio 3 different ways
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7. Ratios and Proportions
There are 18 green marbles and 12 red marbles in a bag. What is the ratio, in simplest form, of the number of green marbles to the number of red marbles?

8. Ratios and Proportions
4. There are 36 girls and 24 boys in the school chorus. In three different ways, write the ratio, in simplest form, of the number of girls to the number of students in the chorus.

9. Ratios and Proportions
5. There are 12 orange lollipops and 14 cherry lollipops in a bag. What is the ratio, in simplest form, of the number of cherry lollipops to the number of orange lollipops?
STOP

10. Ratios and Proportions
A proportion is 2 equal ratios.
Example:
Here we have two ratios. We have 4 compared to 12 and 1 compared to 3. There two ratios form a proportion. Simplified, they equal the same thing. You can simplify four-twelfths and it equals one-third.

11. Ratios and Proportions
To determine if two ratios form a proportion:
Reduce or multiply one (or both) of the ratios in order to get common denominators
Once you have common denominators, see if the numerators are the same. If both ratios match perfectly, they are proportions!

12. Determine Whether each pair of ratios forms a proportion

13. Determine Whether each pair of ratios forms a proportion

14. Determine Whether each pair of ratios forms a proportion

15. Determine Whether each pair of ratios forms a proportion