Ratios and Proportions (Sec. 2)

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

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

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

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

There are 4 birds and 6 snakes. What is the ratio of birds to snakes?

• 6/4
• 4/6
• 1/3
• 10/16

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CCSS.6.RP.A.1

CCSS.6.RP.A.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

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CCSS.6.RP.A.1

CCSS.6.RP.A.3

Express the ratio as a fraction in simplest form:
18 ounces to 3 cups

• 6 to 1
• 1/6
• 18/3
• 3/18

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CCSS.7.RP.A.2

CCSS.7.RP.A.1

Which ratio is equivalent to 12:20

• 20:12
• 2:3
• 3:5
• 3:10

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CCSS.6.RP.A.3A

Which is NOT equivalent to 3:5?

• 15:25
• 9:15
• 21:28
• 30:50

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CCSS.7.RP.A.2

CCSS.7.RP.A.1

CCSS.7.RP.A.3

The ratio of 6th graders to 7th graders at a basketball game is 4:1.  If there are eight 7th graders, how many 6th graders are there?

• 28
• 16
• 8
• 32

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CCSS.7.RP.A.2

CCSS.7.RP.A.3

If we have the following recipes for juice, which one will taste the most cherry:
Sam:  1 part cherry, 4 parts sprite 
Katie: 2 parts cherry, 4 parts sprite
Michael: 6 parts cherry, 8 parts sprite 

• Michael
• Katie
• Sam

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CCSS.7.RP.A.2

CCSS.7.RP.A.1

In a class of 30 kids, 3 forgot to get their report cards signed. What percent is that?

• 3%
• 30%
• 10%
• 70%

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CCSS.7.RP.A.2

CCSS.7.RP.A.3