The word percent means:

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Presentation transcript:

The word percent means: 1 8 =.125=12.5%

Express as a decimal: 1 100 %= Check Point 3: 2.3% Check Point 3: a. .67 b. 2.5 Express as a decimal: 1 100 %=

Three types of % problems What is 3% of 200? 2. 3 is 60% of what number? 3. 18 is what percent of 90? 6 5 20%

Sales Tax The book on page 490 gives a formula 𝐴=𝑃∙𝐵 ---- we will not be using this formula. Check Point 4: a. $75.60 b. $1335.60

Discount Check Point 5: a. $133 b. $247

Percent and Change Percent increase and percent decrease can be found by the following formulas:

Check Point 6: a. 10−6 6 = 2 3 =𝟔𝟔 𝟐 𝟑 % b. 10−6 10 = 2 5 =40%

Abuses of Percent 225% is not “an increase of more than 300%.”

Math XL Problems