Percents Review

Front

What is the formula to calculate percent change?

Back

Percent Change = ((New Value - Old Value) / Old Value) * 100

Front

How do you convert a percentage to a decimal?

Back

To convert a percentage to a decimal, divide the percentage by 100.

Front

What is the percent of boys in a class with 14 boys and 21 girls?

Back

Percent of boys = (Number of boys / Total students) * 100 = (14 / (14 + 21)) * 100 = 40%.

Front

How do you convert 230% to a decimal?

Back

To convert 230% to a decimal, divide by 100: 230% = 230 / 100 = 2.3.

Front

What does it mean when sales tax is added to the price?

Back

It means that the final price paid by the customer will be the original price plus the sales tax amount.

Front

What is the definition of percent?

Back

Percent means 'per hundred' and is a way to express a number as a fraction of 100.

Front

If an item costs $50 and is on sale for $40, what is the percent decrease?

Back

Percent Decrease = ((50 - 40) / 50) * 100 = 20%.

Front

What is the relationship between fractions, decimals, and percentages?

Back

Fractions, decimals, and percentages are different ways to represent the same value. For example, 1/2 = 0.5 = 50%.

Front

How do you find the total price after adding sales tax?

Back

Total Price = Original Price + (Original Price * Sales Tax Rate).

Front

What is a common mistake when calculating percent change?

Back

A common mistake is to subtract the old value from the new value without dividing by the old value first.