percentage

Front

What is the percent equation?

Back

The percent equation is a mathematical representation that relates a part to a whole using the formula: Part = Percent × Whole.

Front

How does percent relate to proportional quantities?

Back

Percent is a constant proportionality and the equation has the same form as y=mx.

Front

If 21 is 60% of a whole, how do you find the whole?

Back

To find the whole, use the formula: Whole = Part / (Percent/100). In this case, Whole = 21 / (60/100) = 35.

Front

What is the formula to calculate sales tax?

Back

Sales Tax = Price × Sales Tax Rate.

Front

Lily pays $3.50 sales tax on a $70 item. What is the sales tax rate?

Back

Sales Tax Rate = (Sales Tax / Price) × 100 = ($3.50 / $70) × 100 = 5%.

Front

What percent of 50 cars received oil changes if 10 cars did?

Back

Percent = (Part / Whole) × 100 = (10 / 50) × 100 = 20%.

Front

Dianne buys a movie for $10 and pays 5% sales tax. How much tax does she pay?

Back

Sales Tax = $10 × 0.05 = $0.50.

Front

Brey buys the same movie for $12 and pays 4% sales tax. How much tax does he pay?

Back

Sales Tax = $12 × 0.04 = $0.48.

Front

Who pays more sales tax: Dianne or Brey?

Back

Dianne pays more tax than Brey ($0.50 vs $0.48).

Front

What is the relationship between percent and fractions?

Back

Percent can be expressed as a fraction by dividing the percent by 100. For example, 25% = 25/100 = 1/4.