Ratios and Proportions Pre-Algebra Ch. 6

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

What is a proportion?

Back

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

Front

How do you solve a proportion?

Back

To solve a proportion, cross-multiply the terms and then solve for the unknown variable.

Front

What is the formula for finding the cost per item?

Back

Cost per item = Total cost / Number of items.

Front

If 18/24 = x/4, what is x?

Back

x = 3.

Front

How do you find the unit rate?

Back

To find the unit rate, divide the total quantity by the number of units.

Front

If 60 minutes are for 4 games, how many minutes is that per game?

Back

15 minutes per game.

Front

What is the relationship between ratios and fractions?

Back

Ratios can be expressed as fractions, where the first quantity is the numerator and the second quantity is the denominator.

Front

If b/54 = 8/9, what is b?

Back

b = 48.

Front

How do you set up a proportion to solve a problem?

Back

Identify the two ratios that are being compared and set them equal to each other.