Percent and Percent Change Flashcard Review

Front

What is 40% of 80?

Back

32

Front

What is \( \frac{17}{20} \) as a percent?

Back

85%

Front

If a metal bar weighs 25 ounces and contains 15 ounces of lead, what percent of the bar's weight is lead?

Back

60%

Front

What is the percent change if the price of a ticket increases from $100 to $120?

Back

20%

Front

What does the percent proportion \( \frac{a}{w} = \frac{p}{100} \) represent?

Back

It represents the relationship between part (a), whole (w), and percent (p).

Front

How do you calculate the percent of a number?

Back

Multiply the number by the percent (as a decimal).

Front

What is the formula for percent change?

Back

Percent Change = \( \frac{New Value - Old Value}{Old Value} \times 100 \)

Front

If you have 50 apples and give away 10, what percent of the apples did you give away?

Back

20%

Front

What is 25% of 200?

Back

50

Front

How do you convert a fraction to a percent?

Back

Multiply the fraction by 100 and add a percent sign.