Percent of a Number

Front

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

Back

To find a percentage of a number, multiply the number by the percentage (in decimal form). Formula: (Percentage/100) * Number.

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, 30% becomes 0.30.

Front

What is 30% of 70?

Back

21

Front

What is 70% of 90?

Back

63

Front

If 42 is 60% of a number, how do you find that number?

Back

To find the number, divide 42 by 0.60. The number is 70.

Front

In a survey, if 10% of people said they live in a city and 60 people said they live in a city, how do you find the total number of people surveyed?

Back

To find the total number surveyed, divide the number of people who said they live in a city (60) by the percentage (0.10). Total surveyed = 600 people.

Front

What is 60 as 30% of what number?

Back

To find the number, divide 60 by 0.30. The number is 200.

Front

What does it mean if a number is a certain percentage of another number?

Back

It means that the first number is that fraction of the second number. For example, if 30 is 30% of 100, then 30 is one-third of 100.

Front

How can you check if your percentage calculation is correct?

Back

You can check by reversing the calculation: if you found that 30% of 100 is 30, you can check by calculating 30 is 30% of 100.

Front

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

Back

Percentages are a way to express a number as a fraction of 100. They can be converted to decimals by dividing by 100 and to fractions by placing the percentage over 100 and simplifying.