Unit 2 Practice

Front

What is a ratio?

Back

A ratio is a relationship between two numbers indicating how many times the first number contains the second.

Front

How do you find the total number of items when given a ratio and total count?

Back

To find the total number of items, divide the total count by the sum of the ratio parts and then multiply by the parts of the ratio.

Front

If the ratio of yellow marbles to blue marbles is 4 to 7, how many blue marbles are there if there are 44 total marbles?

Back

28 blue marbles.

Front

What is percentage?

Back

Percentage is a way of expressing a number as a fraction of 100.

Front

How do you calculate the total enrollment if 35 boys represent 5% of it?

Back

Divide the number of boys by the percentage (in decimal form): 35 / 0.05 = 700.

Front

What is average speed?

Back

Average speed is the total distance traveled divided by the total time taken.

Front

If a car travels 150 miles in 3 hours, what is its average speed?

Back

50 miles per hour.

Front

What is a unit rate?

Back

A unit rate is a comparison of two different quantities when they are combined together.

Front

How do you find the time taken to swim a certain number of laps if you know the time for a different number of laps?

Back

Use the unit rate of laps per time to calculate the time for the desired number of laps.

Front

If Olivia swims 12 laps in 45 minutes, how long would it take her to swim 9 laps?

Back

33.75 minutes.