Ratios
What are the two different ways to write a ratio algebraically?
A/B
A:B
What method do we use when solving proportions?
Cross Multiplication
What is the percent proportion?
part/whole = %/100
Two friends went to dinner and the total was $27.60. If they decide to leave a 20% tip, how much money did they leave for a tip?
What is $5.52?
Write 93% as a fraction.
93/100
My music department has 6 guitars, 4 microphones, 2 banjos, and 5 amplifiers. What is the ratio of banjos to microphones. (simplify if necessary)
2/4 simplifies to 1/2
2:4 simplifies to 1:2
4/20 = 5/x
X = 25
2 is what percent of 50?
4
Tommy wanted a new laptop that cost $1350. If he has a coupon for 30% off, how much does he pay for the laptop?
$945
(1350 - 405)
Write 8% as a decimal.
0.08
My music department has 6 guitars, 4 microphones, 2 banjos, and 5 amplifiers. What is the ratio of amplifiers to total equipment? (simplify, if necessary)
5:17
5/17
7/3 = 14/x
x = 6
What is 30% of 50?
15
On a shopping spree at Sephora, Andie's subtotal was $65 in skin care products. If the sales tax is 9%, what was the final cost of the products?
$70.85
(65 + 5.85)
Write 0.743 as a percent
74.3%
Give a common example of a unit rate.
Examples: miles per hour, miles per gallon, cost per unit, pay per hour
x/9 = 63/27
x = 21
75 is 20% of what number?
375
The meteorologist at Channel 8 News predicted that a snowstorm would drop 7 inches of snow. After the storm, she reported that the actual snowfall was 4 inches. What is the percent error for the meteorologist's prediction?
percent error=amount of error/correct amount
3/4 = 0.75 75% error
Write 0.143 as a fraction
143/1000
If I drove 180 miles in 6 hours, how many miles did I drive per hour?
180/6 = 30 mph
Jennifer's class is a ratio of 4 boys to 5 girls. If Jennifer's class has 16 boys in it, how many girls are in the class?
20 girls
Mandy got 48 questions correct out of 60 questions on her most recent test. What percent did she receive?
48/60= x/100
x=80%
Tom and Jerry went to dinner and order $50 worth of food. They have a coupon for 15% off, but they also have to pay 7% tax. So, how much was the total bill?
50 -7.50 =42.50
42.50 + 2.975=45.475 rounds to $45.48
Write 3/8 as a decimal
0.375