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 of a total?

Back

The formula is: (Part/Total) x 100 = Percent.

Front

If 225 out of 250 seats are sold, how do you find the percent of empty seats?

Back

First, find the number of empty seats: 250 - 225 = 25. Then, use the formula: (25/250) x 100 = 10%.

Front

How do you find the grade percentage from a test score?

Back

Use the formula: (Points Earned/Total Points) x 100. For example, if Eric earned 60 out of 75 points, (60/75) x 100 = 80%.

Front

What does it mean to miss questions on a test in terms of percentage?

Back

To find the percentage of questions missed, use the formula: (Questions Missed/Total Questions) x 100. For Phil, (11/88) x 100 = 12.5% missed.

Front

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

Back

Use the formula: Total = Part / (Percent/100). For example, if 34% of a number is 51, then Total = 51 / (34/100) = 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 x 100 = 25%.

Front

How can you express 60% as a decimal?

Back

To convert a percentage to a decimal, divide by 100. So, 60% = 60/100 = 0.60.

Front

What is the percent increase formula?

Back

Percent Increase = ((New Value - Original Value) / Original Value) x 100.