Ratios, Rates, & Proportions. Oh My!

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 calculate a rate?

Back

A rate is calculated by dividing one quantity by another, typically with different units, such as speed (distance/time).

Front

What is a proportion?

Back

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

Front

If Justin types 408 words in 4 minutes, how many words does he type per minute?

Back

102 words per minute.

Front

Which is the better buy: A 4 pack of t-shirts for $2.24 or a 6-pack for $3.12?

Back

A 6-pack of t-shirts for $3.12 is the better buy.

Front

How do you find the unit price?

Back

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

Front

What is the formula for finding a missing value in a proportion?

Back

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

Front

If 4 pounds of ham costs $19.00, what is the cost per pound?

Back

The cost per pound is $4.75.

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 is the denominator.

Front

How do you solve a proportion?

Back

Cross-multiply and then solve for the unknown variable.