Ratios, Rates & Proportions (Test Review)

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 rate?

Back

A rate is a specific kind of ratio that compares two different units, such as speed (miles per hour) or price (dollars per item).

Front

What is a proportion?

Back

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

Front

How do you find the constant of proportionality?

Back

The constant of proportionality can be found by dividing one quantity by the other in a proportional relationship.

Front

If 150 grams of fertilizer is needed for 6 acres, how much is needed for 1 acre?

Back

25 grams.

Front

If a worker earns $9 per hour, how much will they earn in 3 hours?

Back

$27.

Front

How do you calculate the unit rate?

Back

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

Front

What is the formula for solving proportions?

Back

Cross-multiply the two ratios and set them equal to each other.

Front

If Harry mowed 8 lawns for $96, how much did he earn per lawn?

Back

$12 per lawn.

Front

What does it mean if two quantities are directly proportional?

Back

If two quantities are directly proportional, as one quantity increases, the other quantity increases at a constant rate.