Ratios & Proportions

Front

A ratio is

Back

a comparison between 2 quantities

Front

What is a proportion?

Back

A statement of 2 ratios

Front

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

Back

Cross multiply

Front

In geometry, what tends to happen to most problems?

Back

They become algebra problems.

Front

Two out of every 3 students in Mr. Pearson’s ninth grade class recycle aluminum cans. If 48 students recycle aluminum cans, HOW MANY STUDENTS are in Mr. Pearson’s class?

Back

72

Front

Cindy’s job is to check computer printers for defects. Out of 420 printers she has to check, only 3 of the first 84 have been defective. Using this information, what is the best prediction of the TOTAL NUMBER OF DEFECTIVE PRINTERS? (Set up your ratio)

Back

15

Front

A recipe for 2.5 dozen whole-wheat muffins requires 600 g of flour. How many muffins can be made with 900 g of flour?

Back

3.75 dozen or 45 muffins

Front

Sandra wants to give a party for 60 people. She has a punch recipe that makes 2 gallons of punch and serves 15 people. How many gallons of punch should she make for her party?

Back

To find out how many gallons of punch Sandra needs, we can set up a proportion. If 2 gallons serve 15 people, then for 60 people, we can calculate the required gallons as follows: \( \frac{2}{15} = \frac{x}{60} \). Solving for \( x \) gives us \( x = 8 \). Therefore, she should make 8 gallons of punch.

Front

A model airplane is made to the scale 1 inch to 24 inches. If the wing of the actual plane is 18 feet long, how long will the model wing be in inches?

Back

9

Front

Orlando makes a quarter for every dozen envelopes he stuffs. How many envelopes will he have to stuff to make $10.00?

Back

480