Percentage problems

Front

What is a percentage?

Back

A percentage is a way of expressing a number as a fraction of 100. It is often used to compare proportions.

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 20% of 50, calculate 50 x 0.20 = 10.

Front

What does 40% of 200 represent in a real-world context?

Back

It represents 40 out of every 100 parts of 200. In this case, if 200 children attended a play, 40% means 80 boys attended.

Front

If 75% of a number is 30, what is the number?

Back

To find the number, divide 30 by 0.75. The number is 40.

Front

What is 10% of 80?

Back

10% of 80 is 8.

Front

How do you convert a percentage to a decimal?

Back

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

Front

What is 25% of 80?

Back

25% of 80 is 20.

Front

If a student scores 75% on a test with 40 questions, how many questions did they answer correctly?

Back

They answered 30 questions correctly (0.75 x 40 = 30).

Front

What is the formula to find the percentage increase?

Back

Percentage Increase = ((New Value - Original Value) / Original Value) x 100.

Front

How do you find the percentage decrease?

Back

Percentage Decrease = ((Original Value - New Value) / Original Value) x 100.