Problems
The amount of money donated at a charity fundraising event is directly proportional to the number of people at the event. 6 people at the event donated a total of $120. How much did 50 people at the event donate?
What is 1,000?
What percent is 24 of 300? (Hint: 300 is the original value)
What is 8%
x=3, y=7, k=21
What is inverse proportion
John buys a pair of shoes for $52 and pays $2.60 sales tax. How much sales tax will his friend pay if his friend purchases a shirt for $28?
What is $1.30
What percent of 140 is 3.5?
What is 2.5%
x=2, y=4, k=2
What is direct proportion?
Name one equation for direct proportion
What is y=kx OR k=y/x
It costs $78 to rent a pair of skis for 3 days. Find the cost of renting the skis for a week. Explain your work.
78/3=x/7. Multiply 78/3 times 7. $182
The graph looks like a curve and may or may not cross x=1, but never crosses the x- or y-axis
What is inverse proportion?
What is the ratio for percent increase
What is amount increase over original amount
Emma can type 275 words in 5 minutes. The number of words she types is directly proportional to the length of time she takes to type, t minutes. How many minutes will it take her to type a 935 word document?
What is 17 minutes
What number is 103% of 127?
What is 130.81
The graph is a straight line. It must go through the origin (0,0).
What is direct proportion
Name one equation for inverse proportion
What is xy=k OR y=k/x
Blake needs to determine the height of each tree on his tree farm. He knows the height of the tree, h feet, is directly proportional to the length of its shadow, d feet. The length of a shadow cast by an 8 foot tall tree is 5 feet. Find the constant of proportionality.
What is 8/5
63 is what percent of 9?
What is 700%
In 2004, 12.9 children played soccer in schools on average. In 2012, 13.8 children played soccer in schools on average. Find the percent of change.
What is 7%
This is the point that can be easily used to find the COP of a direct proportion.
What is the point (1, y)
Describe how to find the percent increase or decrease if you know the original price and the new price of something.
What is 100*the difference in price/the original price