Percentage Proportions review

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 is the formula to find the total number of items if you know the percentage and the number of items?

Back

If you know the percentage and the number of items, use the formula: Total Items = (Number of Items / Percentage) x 100.

Front

If 64% of a number is 48, what is the number?

Back

To find the number, use the formula: Number = (48 / 64) x 100 = 75.

Front

What is the grade percentage if a student answers 77 out of 88 questions correctly?

Back

Grade Percentage = (77 / 88) x 100 = 87.5%.

Front

How do you convert a fraction to a percentage?

Back

To convert a fraction to a percentage, divide the top number (numerator) by the bottom number (denominator) and multiply by 100.

Front

What is 80% of 50?

Back

80% of 50 is calculated as 50 x 0.80 = 40.

Front

If a student answered 28 questions correctly and this represents 80% of the test, how many questions were on the test?

Back

Total Questions = (28 / 0.80) = 35 questions.

Front

What is the water weight of a person weighing 180 pounds if 60% of their body weight is water?

Back

Water Weight = 180 x 0.60 = 108 pounds.

Front

How do you find the percentage of a favorite city chosen by students?

Back

Percentage = (Number of students who chose the city / Total number of students) x 100.