Percent Problems

Front

What is a percent?

Back

A percent is a way of expressing a number as a fraction of 100. It is denoted by the symbol '%'. For example, 50% means 50 out of 100.

Front

How do you calculate 30% of a number?

Back

To calculate 30% of a number, multiply the number by 0.30 (or 30/100). For example, 30% of 20 is 20 x 0.30 = 6.

Front

If Sarah earns $20 a day and spends 30% of it, how much does she spend?

Back

Sarah spends $6 on Monday.

Front

What is the formula to find the percentage of a total?

Back

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

Front

How do you find out how many students are a certain percentage of a class?

Back

Multiply the total number of students by the percentage (as a decimal). For example, 75% of 20 students is 20 x 0.75 = 15 students.

Front

If 75% of students in a class are 60 inches or taller, how many are that if there are 20 students?

Back

15 students are 60 inches or taller.

Front

What does it mean if a pitcher won 80% of the games he pitched?

Back

It means that out of all the games he pitched, 80% were wins. If he pitched 35 games, he won 28 games.

Front

How do you calculate the number of successful attempts in a percentage problem?

Back

Multiply the total attempts by the success rate (as a decimal). For example, if Madelyn made 45% of 20 shots, she made 9 shots.

Front

What is 45% of 20?

Back

45% of 20 is 9.

Front

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

Back

Use the formula: (Part/Whole) x 100 = Percentage. For example, to find what percent 12 is of 600, calculate (12/600) x 100 = 2%.