Percent Proportions

Front

What is a percent?

Back

A percent is a ratio expressed as a fraction of 100. It represents a part of a whole.

Front

How do you calculate a percentage of a number?

Back

To calculate a percentage of a number, multiply the number by the percentage (in decimal form). For example, to find 40% of 230, calculate 230 x 0.40 = 92.

Front

What is the formula to find the percent grade?

Back

Percent grade = (Points earned / Total possible points) x 100.

Front

If 80% of a group does not know something, what percent does know it?

Back

If 80% do not know, then 100% - 80% = 20% know it.

Front

How do you find the total number when given a percentage and a part?

Back

To find the total, divide the part by the percentage (in decimal form). For example, if 34% of a number is 51, then Total = 51 / 0.34 = 150.

Front

What is the relationship between fractions and percentages?

Back

Fractions can be converted to percentages by multiplying by 100. For example, 1/4 = 0.25 = 25%.

Front

How do you convert a percentage to a decimal?

Back

To convert a percentage to a decimal, divide by 100. For example, 75% = 0.75.

Front

What does it mean if a number is 10% of another number?

Back

It means that the first number is one-tenth of the second number.

Front

How do you find the percentage of a total that is empty?

Back

To find the percentage of seats that are empty, subtract the number of sold seats from the total seats, then divide by the total seats and multiply by 100.

Front

What is the percent of a number that is sold if 225 out of 250 seats are sold?

Back

Percent sold = (225 / 250) x 100 = 90%.