Ratios and Proportions Set Up

A ratio is

• comparing a bunch of numbers

• a comparison between 2 quantities

• an estimation of an amount

• a variable

Tags

CCSS.6.RP.A.1

CCSS.6.RP.A.2

A proportion is a

• ratio statement

• an "if-then" statement

• a statement of 2 ratios

• a comparison

Tags

CCSS.6.RP.A.3A

All of the following are proper representations of a ratio EXCEPT

• a/b

• a to b

• a:b

• a over b

Tags

CCSS.6.RP.A.1

CCSS.6.RP.A.2

To solve for missing info in a proportion statement you must first

• Cross multiply

• Divide everything

• Get rid of variables

• Guess

Tags

CCSS.7.RP.A.3

An engineer created a scale drawing of a building using a scale in which 0.25 inch represents 2 feet. The length of the actual building is 250 feet. What is the length in inches of the building in the scale drawing? Set up the proportion box based on the given labels.

e

f

g

d

100

20

1.75

2

x

250

25

0.25

Tags

CCSS.7.RP.A.2C

Is the pair of ratios proportional?

• yes

• no

Tags

CCSS.7.RP.A.2A

Are the two ratios proportional?

• YES

• NO

Tags

CCSS.7.RP.A.2A

A recipe for fruit salad includes 1/3 cup of grapes for 4 servings. How many cups of grapes are needed for 30 servings of this fruit salad?

Set up the proportion box based on the given labels.

d

e

f

g

1/3

26

4

x

34

100

30

Tags

CCSS.7.RP.A.2C

An engineer created a scale drawing of a building using a scale in which 0.25 inch represents 2 feet. The length of the actual building is 250 feet.

 

What is the length in inches of the building in the scale drawing?

Set up the proportion box based on the given labels.

e

f

g

d

25

x

100

0.25

250

20

2

1.75

Tags

CCSS.7.RP.A.2C

Set up this proportion: Vito uses 9 liters of water to water 24 flower pots. He is wondering how many liters of water (w), it would take to water 40 flower pots. He assumes he'll use the same amount of water on each pot.

Tags

CCSS.7.RP.A.2C