Flashcard on Percents

Front

What is percent error?

Back

Percent error is a measure of how inaccurate a measurement is, compared to the true value. It is calculated using the formula: Percent Error = |(Estimated Value - True Value)| / True Value * 100%.

Front

How do you calculate sales tax?

Back

To calculate sales tax, multiply the price of the item by the sales tax rate (as a decimal). For example, if an item costs $64 and the sales tax is 7.5%, the sales tax amount is $64 * 0.075 = $4.80.

Front

What is percent increase?

Back

Percent increase measures how much a value has grown compared to its original value. It is calculated using the formula: Percent Increase = (New Value - Original Value) / Original Value * 100%.

Front

What is percent decrease?

Back

Percent decrease measures how much a value has reduced compared to its original value. It is calculated using the formula: Percent Decrease = (Original Value - New Value) / Original Value * 100%.

Front

How do you find the final price after a discount?

Back

To find the final price after a discount, subtract the discount amount from the original price. The discount amount is calculated by multiplying the original price by the discount rate (as a decimal).

Front

If a TV costs $280 and is 20% off, what is the discount amount?

Back

The discount amount is $280 * 0.20 = $56. Therefore, the final price is $280 - $56 = $224.

Front

What is the formula for calculating percent of a number?

Back

To find a percent of a number, multiply the number by the percent (as a decimal). For example, to find 15% of 200, calculate 200 * 0.15 = 30.

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, 25% as a decimal is 25 / 100 = 0.25.

Front

What is the difference between a percent increase and a percent decrease?

Back

Percent increase measures how much a value has grown, while percent decrease measures how much a value has reduced. Both are expressed as a percentage of the original value.

Front

If a concert ticket price increased from $75 to $90, what is the percent increase?

Back

Percent Increase = (90 - 75) / 75 * 100% = 20%.