3.1-3.3 Flashcard Review

Front

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

Back

To find a percentage of a number, multiply the number by the percentage (in decimal form). For example, to find 30% of 200, calculate 200 * 0.30 = 60.

Front

How do you calculate the sale price after a discount?

Back

To calculate the sale price after a discount, subtract the discount amount from the original price. For example, for an $80 jacket with a 30% discount: Discount = 80 * 0.30 = $24; Sale Price = 80 - 24 = $56.

Front

What does depreciation mean in terms of value?

Back

Depreciation refers to the reduction in value of an asset over time. For example, if a car depreciates by 20% each year, its value decreases by 20% of its current value annually.

Front

How do you calculate a percentage increase?

Back

To calculate a percentage increase, multiply the original amount by the percentage increase (in decimal form) and add it to the original amount. For example, if Ms. Palermo has 20 boxes and buys 420% more: Increase = 20 * 4.20 = 84; Total = 20 + 84 = 102 boxes.

Front

What is 150% of a number?

Back

To find 150% of a number, multiply the number by 1.5. For example, 150% of 60 is 60 * 1.5 = 90.

Front

What is the meaning of 'percent'?

Back

Percent means 'per hundred' and is used to express a number as a fraction of 100. For example, 30% means 30 out of 100.

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% as a decimal is 30 ÷ 100 = 0.30.

Front

What is the relationship between percentage and fractions?

Back

A percentage can be expressed as a fraction by placing the percentage over 100. For example, 25% can be written as 25/100, which simplifies to 1/4.

Front

How do you find the original price before a discount?

Back

To find the original price before a discount, divide the sale price by (1 - discount rate). For example, if the sale price is $56 after a 30% discount: Original Price = 56 ÷ (1 - 0.30) = $80.

Front

What is the formula for calculating the new value after depreciation?

Back

The new value after depreciation can be calculated using the formula: New Value = Original Value × (1 - Depreciation Rate). For example, for a car worth $15,000 with a 20% depreciation: New Value = 15,000 × (1 - 0.20) = $12,000.