percent proportion

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.

Front

What is the formula to find what percent one number is of another?

Back

The formula is: (part/whole) x 100 = percent.

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 then multiply by 100.

Front

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

Back

Percentages, fractions, and decimals are different ways to represent the same value. For example, 50% = 0.5 = 1/2.

Front

How do you find the whole when given a part and a percent?

Back

Use the formula: whole = part / (percent in decimal form). For example, if 25 is 5% of a number, the whole is 25 / 0.05.

Front

What is the formula to find a number when given a percentage?

Back

The formula is: number = percentage x whole.

Front

How do you express a percentage as a decimal?

Back

To express a percentage as a decimal, divide the percentage by 100. For example, 25% = 0.25.

Front

What is the process to solve for a number when given a percentage and a total?

Back

Multiply the total by the percentage (in decimal form) to find the part.

Front

How do you find the percentage increase or decrease?

Back

Percentage increase = ((new value - old value) / old value) x 100. Percentage decrease = ((old value - new value) / old value) x 100.