Percent of a Number

Front

What is the formula to calculate the percentage of a number?

Back

To calculate the percentage of a number, use the formula: (Percentage / 100) * Total Number.

Front

If 30% of 130 exhibits contain birds, how do you calculate the number of exhibits that contain birds?

Back

Multiply 130 by 0.30 (30% as a decimal): 130 * 0.30 = 39 exhibits.

Front

How do you find what number a percentage is of? For example, if 28 is 70% of a number, how do you find that number?

Back

To find the number, divide the percentage value by the percentage (as a decimal): Number = 28 / 0.70 = 40.

Front

What is 40% of 55 jellybeans?

Back

To find 40% of 55, multiply 55 by 0.40: 55 * 0.40 = 22 jellybeans.

Front

If 60% of 45 people ate nachos, how do you find out how many did not eat nachos?

Back

First, find 60% of 45: 45 * 0.60 = 27. Then subtract from the total: 45 - 27 = 18 people did not eat nachos.

Front

In a school election, if James received 75% of the votes from 240 students, how do you calculate the number of votes he received?

Back

Multiply 240 by 0.75: 240 * 0.75 = 180 votes.

Front

What does it mean to find a percentage of a total?

Back

Finding a percentage of a total means calculating how much a certain percentage represents out of the total amount.

Front

How can you convert a percentage to a decimal?

Back

To convert a percentage to a decimal, divide the percentage by 100. For example, 25% becomes 0.25.

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% = 0.50 = 1/2.

Front

How do you express a percentage as a fraction?

Back

To express a percentage as a fraction, place the percentage over 100 and simplify if possible. For example, 25% = 25/100 = 1/4.