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• -144 ÷ 12 =

• 12(-4) =

• -8 + 10 =

• 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??

Example: Find 40% of 85

• 40 % = 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

What percent of $600 is $450?

• Consider $600 to be the total and $450 to be part of the total.

• 450 = 0.75 600• 0.75 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?