Ratios and Proportions

What is the ratio of red apples to green apples

• 7 apples to 3 green
• 4 red apples to 7 apples
• 4 red apples to 3 green apples
• 3 green apples to 4 red apples

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

There are 7 ushers and 11 technicians helping at the Harper Middle School fall play. What is the ratio of technicians to all helpers?

• 7:11

• 11:18

• 7:18

• 18:11

What are the three ways to write a ratio

• 2;3 , 2 to 3 , 2\3
• 2:3 , 2 to 3 , 2/3
• 2:3 , 2 too 3 , 2/3

Patrick has 2 black, 3 red, and 5   white toy cars. What is the ratio of red toy cars to all the toy cars? 

• 3:5
• 1:3
• 3:11
• 3:10

Are these ratios equivalent? 
2/3 and 8/12?

• No
• Yes

Are these ratios equivalent?
3/4 and  6/12

• Yes
• No

 $\frac{3}{9}=\frac{6}{x}$  

• 8

• 9

• 18

• 2

Solve for x 

• x = 1/10
• x = 10
• x = 4
• x = 5

Hamburger meat sells for $6 for every 3 pounds. If Alicia buys 10 pounds of hamburger meat, how much will she pay?

• $30
• $20
• $60
• $10