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 15% of 82, calculate 82 * 0.15 = 12.3.

Front

What is the formula to find the percent of a part compared to a whole?

Back

The formula is: (Part/Whole) * 100 = Percent.

Front

If 50% of a class of 30 students are girls, how many girls are there?

Back

15 girls (30 * 0.50 = 15).

Front

What does it mean if a number is 25% of another number?

Back

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

Front

How do you convert a fraction to a percent?

Back

To convert a fraction to a percent, divide the numerator by the denominator and multiply by 100.

Front

What is the relationship between percentages, fractions, and decimals?

Back

Percentages can be converted to fractions by dividing by 100 and to decimals by dividing by 100 as well.

Front

If 10% of a number is 20, what is the number?

Back

The number is 200 (20 / 0.10 = 200).

Front

How do you find what percent one number is of another?

Back

Use the formula: (Part/Whole) * 100. For example, to find what percent 51 is of 150, calculate (51/150) * 100 = 34%.

Front

What is the percent increase if a price goes from $50 to $75?

Back

The percent increase is 50% ((75-50)/50 * 100).