Practice on standard 7.RP.3

Front

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

Back

To find a percentage of a number, multiply the number by the percentage (expressed as a decimal). For example, to find 20% of 50, calculate 50 x 0.20 = 10.

Front

How do you calculate a sale price after a discount?

Back

To calculate the sale price after a discount, subtract the discount amount from the original price. For example, if a shirt costs $50 and is 20% off, the discount is $10, so the sale price is $50 - $10 = $40.

Front

What is the formula to increase a quantity by a percentage?

Back

To increase a quantity by a percentage, multiply the original quantity by (1 + percentage as a decimal). For example, to increase 250 grams by 20%, calculate 250 x 1.20 = 300 grams.

Front

How do you find the original number if a percentage of it is known?

Back

To find the original number when a percentage is known, divide the known amount by the percentage (expressed as a decimal). For example, if 15% of a number is 45, the original number is 45 / 0.15 = 300.

Front

What is 25% of a number?

Back

To find 25% of a number, multiply the number by 0.25. For example, 25% of 200 is 200 x 0.25 = 50.

Front

How do you calculate the number of students in a class based on a percentage?

Back

To calculate the number of students based on a percentage, multiply the total number of students by the percentage (expressed as a decimal). For example, if 60% of 30 students are girls, calculate 30 x 0.60 = 18 girls.

Front

What is the relationship between fractions and percentages?

Back

Fractions can be converted to percentages by multiplying the fraction by 100. For example, 1/4 = 0.25, and 0.25 x 100 = 25%.

Front

How do you express a percentage as a decimal?

Back

To express a percentage as a decimal, divide the percentage by 100. For example, 20% as a decimal is 20 / 100 = 0.20.

Front

What is the formula for finding the percentage increase?

Back

To find the percentage increase, subtract the original value from the new value, divide by the original value, and multiply by 100. For example, if a price increases from $50 to $60, the increase is (60 - 50) / 50 x 100 = 20%.

Front

How do you find the percentage decrease?

Back

To find the percentage decrease, subtract the new value from the original value, divide by the original value, and multiply by 100. For example, if a price drops from $50 to $40, the decrease is (50 - 40) / 50 x 100 = 20%.