Ratio/Proportion Review

Ratio/Proportion Review

You have a quiz on Monday. Pay attention to the review and ask questions when you don't understand.

Steps when solving a proportion word problem.

• Read the problem

• Identify the ratio statement and write it down WITH LABELS

• Place the 3rd number with its MATCHING LABEL

• Place an x for your unknown number

• Solve using cross multiplication and division

Multiple Select

At Costco you can buy 16 hot dog buns for $5.60. Which two proportions are set up correctly to solve how much 4 hot dog buns would be?

• $\frac{5.60\ dollars}{16\ buns}=\ \frac{x}{4\ buns}$

• $\frac{5.60\ dollars}{16\ buns}=\frac{8\ buns}{x}$

• $\frac{16\ buns}{5.60\ dollars}=\frac{4\ buns}{x}$

• $\frac{16\ buns}{4\ buns}=\frac{x}{5.60\ dollars}$

Fill in the Blank

The ratio of girls to boys in Mrs. Hall's class is 2 to 3. If Mrs. Hall has 12 girls, how many boys does she have?

Multiple Choice

The amount of sugar in apple juice is 216 grams for every 8 servings. How many grams of sugar would be in 1 serving?

• 0.04 grams

• 27 grams

• 1,728 grams

Multiple Choice

Amy can run 150 meter dash in 50 seconds. How far could she run in 30 seconds?

• 90 meters

• 250 meters

• 4,500 meters

Poll

 $\frac{1200\ meters}{100\ \sec onds}=\frac{x}{400\ \sec onds}$  

Is the proportion above correct for solving this problem: John can run the 1200 meter dash in 400 seconds. How far can he run in 100 seconds?

• Yes

• No

Fill in the Blank

A cookie recipe calls for 4 cups of flour and 2 cups of sugar. Angelica only has 2 cups of flour, so how much sugar should she use?

Multiple Choice

Stacey walked a total of 30, 375 feet. If 2 miles is 10,560 feet, how many miles did Stacey walk? Round to the nearest whole number.

• 1 mile

• 6 miles

• 60,750 miles

Multiple Choice

In Canada, an American citizen purchased 5 liters of gasoline. If 13 gallons equals 49.21 liters, how many gallons of gas did the American purchase? Round to the nearest hundredth.

• 1.32 gallons

• 65 gallons

• 127.95 gallons

Poll

 $\frac{25\ km}{x}=\frac{1\ km}{0.62\ miles}$  

Does the proportion above correctly solve the following problem?  Alex rode his bike 25 kilometers.  If one kilometer is about 0.62 miles, how many miles did Alex ride?

• Yes

• No

Multiple Choice

Which proportion INCORRECTLY solves this problem?

If 20 kilograms equals about 44 pounds, how many pounds is 1 kilogram?

• $\frac{20\ kg}{44\ lbs}=\frac{1\ kg}{x}$

• $\frac{20\ kg}{1\ kg}=\frac{x}{44\ lbs}$

Multiple Choice

If 1 inch is about 2.54 centimeters, how many inches are in 16 centimeters? Round to the nearest whole number.

• 1

• 6

• 41

Fill in the Blank

David is building a doll house that is proportional to his own house. He is using a scale of 0.5 inch = 1 foot. If his house is 24.6 feet tall, how tall is the doll house?

Multiple Choice

Eric is planning to build a raised garden. He sketches a plan with a scale of 1.5 inches = 4 feet. If the garden has a width of 12 feet, what is the width in the drawing?

• 4.5 inches

• 11 inches

• 32 inches