Do Now -144 ÷ 12 = 12(-4) = = 15 – (-3) =

Announcements Integer quiz retakes: –Wednesday, Dec 11 during lunch –Monday, Dec 16 after school Rational Number test FRIDAY, Dec 13

Percents Percent = “per centum” in Latin –Per 100 Percent = a number out of 100 So… What does any percent look like as a fraction?

Percent = a number out of 100 % 100

Percent of a number To find a percent of a number: 1.Convert percent to a fraction 2.Multiply fraction times the number Can you think of another form of 40% we could use to multiply by?? To find a percent of a number: 1.Convert percent to a fraction 2.Multiply fraction times the number Can you think of another form of 40% we could use to multiply by?? Example: Find 40% of % = 40/100 40/100 x 85 40% of 85 = 34 Example: Find 40% of % = 40/100 40/100 x 85 40% of 85 = 34

Finding a percent To find out the percent of one # to another #: 1.Divide the part by the total 2.Times the decimal by 100 To find out the percent of one # to another #: 1.Divide the part by the total 2.Times the decimal by 100 What percent of $600 is $450? Consider $600 to be the total and $450 to be part of the total. 450 = x 100 = 75% What percent of $600 is $450? Consider $600 to be the total and $450 to be part of the total. 450 = x 100 = 75%

Practical applications Calculate percent on a test –# correct divided by total # of questions Calculate a sales price –Percent as a decimal times original price Calculate body fat percentage –Pounds of fat divided by total body weight Can you think of any other examples?? What does this calculation give you??

Practice! Find 30% of 75 What percent of 90 is 50? Find 75% of 400 What percent of 250 is 80? At a recent sale, you paid $150 for a camera that usually costs $325. What is the percent of the discount you received?