Intro to 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 their cross products are equal.

Front

What is a unit rate?

Back

A unit rate is a comparison of two different quantities when they are combined together, expressed as a quantity of one.

Front

Calculate the unit rate: 120 breaths in 4 minutes.

Back

30 breaths per minute.

Front

True or False: 3/10 = 30/100

Back

True.

Front

What is the cross product of the ratios 2/3 and 4/6?

Back

The cross product is 2*6 = 12 and 3*4 = 12, so they are equal.

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

If Lukas made $50 in 5 hours, how much did he make in 1 hour?

Back

$10.

Front

What is the relationship between ratios and proportions?

Back

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

Front

If 5/8 of a pizza is left and you eat 1/4 of it, how much pizza is left?

Back

5/8 - 1/4 = 5/8 - 2/8 = 3/8 of the pizza is left.