Ratios and Proportions 6.12

Front

What is a ratio?

Back

A ratio is a comparison of two quantities by division, showing how many times one value contains or is contained within the other.

Front

How do you write a ratio?

Back

Ratios can be written in three ways: using a colon (e.g., 2:3), as a fraction (e.g., 2/3), or with the word 'to' (e.g., 2 to 3).

Front

What is a proportion?

Back

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

Front

If a recipe calls for 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 to 3.

Front

What is the unit rate?

Back

The unit rate is a ratio that compares a quantity to one unit of another quantity.

Front

If Carlos earns $18 for 2 hours of work, what is his hourly wage?

Back

Carlos's hourly wage is $9 per hour.

Front

How do you find the missing value in a proportion?

Back

To find the missing value in a proportion, cross-multiply and solve for the unknown.

Front

What is the unit cost if 3 CDs cost $45?

Back

The unit cost per CD is $15.

Front

If the ratio of white circles to black squares is 2 to 4, what is the simplified ratio?

Back

The simplified ratio is 1 to 2.

Front

What does it mean if two ratios are equivalent?

Back

It means that they represent the same relationship between quantities.