Show:
basic percents
percent change
discounts and taxes
area and perimeter
i'm feeling lucky
100
what does percent mean?
per hundred
100
The price of a pair of jeans went from
$35 to $22. Is this a decrease or increase?
decrease
100
Categorize each item below as a subtraction or addition:
1) discount
2) tax
3) percent off
discount is subtraction
tax is an addition
percent off is subtraction
100
If rectangle ABCD has a length of 10 inches and a width of 6 inches, what is its area, in square inches?
10x6 = 60 square inches
100
A bag contains 2 red marbles, 5 green marbles, and 3 white marbles. If a marble is selected randomly, what is the probability that it is green?
5 out of 10 are green, so the probability is 5/10. Reduce the fraction to 1/2.
200
what is the proportion you can use to solve any percent problem?
part/whole = percent/100
200
The price of a notebook went from 3 dollars to 1 dollar. What is the percent change?
2/3=x/100
x = 66.7% decrease
200
A pair of shoes regularly priced at $90 is on sale for 35% off. How much is the discount?
x/90 = 35/100
x = $31.50 is the discount
200
what is the perimeter of a rectangle with a length of 5cm and a width of 7cm?
5 + 5 + 7 + 7 = 24 cm
200
What is 3 2/100 in decimal form?
2/100 = .02
so 3 and 2/100 = 3.02
300
what percent is 8 of 23?
8/23 = x/100
x = 34.8%
300
The gas price went from
$3.20 per gallon to $3.60 per gallon. What is the percent change?
3.60 - 3.20 = .40
.40/3.20 = x/100
x = 12.5% increase
300
Bobby bought two shirts that sold for $25.00 each. If tax is 8%, how much will he pay for tax on two shirts?
x/50 = 8/100
x = $4.00 tax charge
300
What is the area of a triangle with a base of 8cm and a height of 10.5cm?
base times height divided by two
8x10.5 =84
84/2 = 42
300
When x = 2.14, what is the value of 2.6x + 8 – 7.2x?
-1.844
400
what is 25% of $130?
x/130 = 25/100
x = $32.50
400
Veryl's ACT score went from 14 to 20. What is the percent change?
6/14 = x/100
x = 42.9% increase
400
An apple laptop, originally priced at $2,500.00, is on sale for 15% off. What is the sale price of the laptop?
x/2,500 = 15/100
x = $375 dollars off
$2,500 - $375 = $2,125 sale price
400
What is the circumference of a circle with a radius of 4 inches to the nearest hundreth?
2 times radius times Pi
2x4x3.14 = 25.12 in
400
For what value of x is the equation 2(x – 6) + x = 18 true?
2(x - 6) + x =18
2x - 12 + x = 18 distribute
3x - 12 = 18 combine like terms
3x = 30 subtract 12 from both sides
x=10 divide both sides by 3
500
34 is 40% of what?
34/x = 40/100
x=85
500
In Ms. Ocampo’s first period, the number of students went from 5 to 12 students at 8:45am. What was the percent change?
12 - 5 = 7
7/5 = x/100
x = 140% increase
500
A pair of boots originally priced at $78.50, is on sale for 60% off. If tax is 8%, what is the final price for the pair of boots to the nearest cent?
x/78.50 = 60/100
x = $47.10 discount
78.50 - 47.10 = $31.40 discount price
x/31.40 = 8/100
x= $2.51 sales tax
31.40 + 2.51 = $33.91 final price
500
What is the area of a circle with a diameter of 10cm?
Pi times radius squared
radius = 5
3.14 x 5 x 5 =78.5 cm squared
500
What is the slope of any line parallel to 2x + 3y = 9?
m = -2/3