Proportions

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

Front

How do you determine if two ratios form a proportion?

Back

Two ratios form a proportion if the cross products are equal.

Front

What is the cross product of the ratios a/b and c/d?

Back

The cross product is ad and bc. If ad = bc, then a/b = c/d is a proportion.

Front

If 3/4 = x/16, what is the value of x?

Back

x = 12.

Front

What is the formula to solve for a missing value in a proportion?

Back

If a/b = c/d, then ad = bc.

Front

If a recipe requires 2 cups of flour for every 3 cups of sugar, what is the ratio of flour to sugar?

Back

The ratio of flour to sugar is 2:3.

Front

How many quizzes will Harold have to attend to reach 20 quizzes if he takes 8 quizzes in 2 weeks?

Back

Harold will have to attend 5 weeks.

Front

If a team-building event costs $12 for 4 attendees, how much does it cost per attendee?

Back

It costs $3 per attendee.

Front

If 80 words can be typed in 1 minute, how many words can be typed in 30 minutes?

Back

2400 words.

Front

What is the relationship between ratios and proportions?

Back

Ratios compare two quantities, while proportions show that two ratios are equal.