Proportional Reasoning Pre-Algebra

What is a Ratio?

• Is a comparison of two quantities 

• A rate with a denominator of one

• It is when the only factor the numerator and denominator share is a one 

• Two decimals that can be multiplied

What is the missing number in the ratio table?

• 21

• 24

• 27

• 25

The ratio of girls to boys is 3:8. If there are 48 boys, how many girls are there? Use the tape diagram to help you solve.

• 6

• 24

• 18

• 72

Are the two ratios proportional?

• YES

• NO

• 10.8
• 7.5

Does this equation represent a proportional relationship?

• Yes

• No

Is this a proportional equation? Why?

• It is not proportional because it doesn't have anything added to it.

• It is proportional because it doesn't have anything added to it.

Is this a proportional equation?

• It is not proportional.

• It is proportional.

The table shows the weight in pounds of objects on earth compared to objects on the moon.  If an object on earth weighs 42 lbs, what is its weight on the moon?

• 7 lbs

• 12 lbs

• 84 lbs

• 252 lbs

Does this equation represent a proportional relationship?

• Yes

• No