6-1 Percent Proportion

Front

What is a percent proportion?

Back

A percent proportion is a way to express a part of a whole as a percentage. It is often used to find out how much one quantity is in relation to another.

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 25% of 80, calculate 80 x 0.25 = 20.

Front

What does it mean when we say 'X is Y% of Z'?

Back

It means that X is a certain percentage (Y%) of the total amount Z. This can be expressed mathematically as X = (Y/100) * Z.

Front

How do you convert a percentage to a decimal?

Back

To convert a percentage to a decimal, divide the percentage by 100. For example, 45% becomes 0.45.

Front

What is the formula to find the whole when given a part and a percentage?

Back

The formula is: Whole = Part / (Percentage/100). For example, if 9 is 45% of a number, the whole is 9 / 0.45 = 20.

Front

What is 34% of 150?

Back

51

Front

If 225 seats were sold out of 250, what percent of the seats were sold?

Back

90% of the seats were sold.

Front

What is 15% of 82?

Back

12.3

Front

How do you find the percentage of a total that is not sold?

Back

To find the percentage of seats not sold, subtract the sold seats from the total seats, then divide by the total seats and multiply by 100.

Front

What is 25% of 80?

Back

20