Percent is a ratio that compares a number to 100. Some examples of percents are
He received 75% on his test.
There is a 30% chance it will rain today.
She paid 1.9% financing on a car loan.
Expressing a Percent as a Frac
Applications of Percent
Calculate the total cost of a $24.99 shirt including HST.
In Ontario, we pay harmonized sales tax or HST. HST is 13%.
= 13% of 24.99
Total cost = 24.99 + 3.25
Curve of Best Fit Note
Sometimes the data does not lie along a line but along a curve. In this case, a curve of
best fit is used.
The data below shows the number of Internet Hosts (in the millions) around the world
Kiss Our Classes Goodbye!
Your class is planning a trip to an attraction in Winnipeg, Manitoba. Use the information below to
help make some decisions about where you are going; how you will get there and how long, you
A ratio is a comparison of two or more quantities.
The ratio of students to computers in a school is 5 to1.
Suppose a day-care centre must maintain a certain ratio of 1:10 of staff to children.
A recipe for punch calls for a rati
Solving Proportions Note
Any two or more ratios that simplify to the same lowest terms are equivalent ratios.
1 : 2 , 2 : 4 and 3 : 6 are all equivalent ratios
2 : 4 = =1 : 2
Show that 12 : 16 and 60 : 80 are equivalent ratios.
Scatter Plots Note
A scatter plot is a graph of data that is a series of points.
The graph below is data collected from students studying for a test. It is an example of a
Use the scatter plot above to answer the fol
1. Allan bought a toque that was marked down 30%.
a) The original price was $18.99. What is the sale price? (2 marks)
b) What will Allan pay for the toque, including 15% taxes? (2 marks)
3. A gardeners 120-m2
Identify the choice that best completes the statement or answers the question.
1. Determine the measure of the unknown angle.
Ratios in Lowest Terms Note
A ratio in its simplest form is referred to as being in lowest terms.
Express 6:4 as a ratio in lowest terms.
Using the letters below, write the ratio of A : B in lowest terms.
Name : _
Perimeter and Area Problems
1. Determine the Perimeter and Area of Each Figure
1. Queen Elizabeth District High School has an area of 48m2
a. The width of the building 6 m. What is the length of the building?
b. If the length of the buildin
Line of Best Fit Note
The scatter plot below shows winning times for the mens100 m between 1981 and
What year was the winning time 11.2 s? _
What was the winning time in 1983? _
c. Decide if the data show a relationship. If they