7.3 Proportions Test

Front

What is a proportion?

Back

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

Front

How do you find a percentage of a number?

Back

To find a percentage of a number, multiply the number by the percentage (in decimal form). For example, to find 62% of 37.1, calculate 37.1 * 0.62.

Front

If 5 screwdrivers are sold for every 2 cordless drills, what is the ratio of screwdrivers to cordless drills?

Back

The ratio of screwdrivers to cordless drills is 5:2.

Front

How do you calculate the total needed based on a ratio?

Back

To calculate the total needed based on a ratio, set up a proportion using the known quantities and solve for the unknown.

Front

What is the formula to calculate the percentage made from attempts?

Back

The formula is (Number of Successful Attempts / Total Attempts) * 100.

Front

If Sandy made 9 free throws out of 12 attempts, what percentage did she make?

Back

Sandy made 75% of her free throws.

Front

How do you scale a measurement on a map to real distance?

Back

To scale a measurement, use the scale provided. For example, if 1/2 inch = 4.5 miles, then multiply the number of inches by the scale factor.

Front

What is the distance in miles if Simon measured 2 3/4 inches on a map where 1/2 inch = 4.5 miles?

Back

The distance is 24 3/4 miles.

Front

How do you determine how much of a resource is needed for a larger group based on a smaller group?

Back

Use the ratio of the resource per person and multiply it by the number of people in the larger group.

Front

If 8 people can be fed by a 5-pound turkey, how many pounds are needed for 20 people?

Back

You would need 12.5 pounds of turkey.