What is the topic?
Clicker questions as your clue 
Grade 8 Math
The most/least popular kind of
music/sport/fast food
-From Grade 8 St. Columba C.S.
What do you think is the most popular
kind of music in this class?
 A. Classical Music
 B. Rock Music
 C. Metal Music
 D. Hip-hop Music
 E. Jazz
What do you think is the most popular
kind of sport in this class?
 A. Football
 B. Soccer
 C. Hockey
 D. Volleyball
 E. Swimming
What do you think is the most popular
kind of fast food in this class?
 A. McDonald
 B. Burger King
 C. Pizza Pizza
 D. KFC
 E. Subway
What is the topic for today?
 A. Number Sense
 B. Data management
 C. Patterning and Algebra
 D. Measurement
 E. Geometry and Spatial Sense
Review: Tally chart
 Tally Chart: A method of counting frequencies, according to
some classification, in a set of data
Pet
Cat
Dog
Fish
Tally Marks
Number
Review: Mean
 Mean:the mean of a set of numbers is found by dividing the
sum of the numbers by the number of numbers in the set
 Mean= Sum of the numbers
Number of numbers
Review: Ratio
 Ratio: a comparison of quantities with the same units. A ratio
can be expressed in ratio form or in fraction form; for
example, 3:4 or ¾
Hands on activity
-grade 8
Activity: Textbook Page 90
 Gather cubes in two different ways
 Divide into 5 groups
 A reporter from each group
 Individual: takes turn to repeats for 3 times with two ways:




hand up and hand down
Individual: fills in Tally chart and calculate the number
Individual: calculate means for your two ways
Group: fill in Mean and Ratio chart
Class: guess which chart to use
Different types of graph
-grade 8
Graphs
 Graphs are pictures that help us understand amounts.
 These amounts are called data.
 There are many kinds of graphs, each having special parts.
 What are the elements of a graph?
Graphs
 Type
 Title
 Labels on the axes
 Units for the scales
 Legend
What type of graph is this?
 A. a bar graph
 B. a pictograph
 C. a line graph
 D. a scatter plot
 E. a stem-and-leaf plot
 F. a circle graph
4th Qtr Sales
3rd Qtr 9%
10%
2nd Qtr
23%
1st Qtr
58%
What type of graph is this?
 A. a bar graph
 B. a pictograph
 C. a line graph
 D. a scatter plot
 E. a stem-and-leaf plot
 F. a circle graph
14
12
10
8
6
4
2
0
Series 3
Series 2
Series 1
What type of graph is this?
 A. a bar graph
 B. a pictograph
 C. a line graph
 D. a scatter plot
Category 4
Category 3
Series 3
Series 2
Series 1
Category 2
 E. a stem-and-leaf plot
 F. a circle graph
Category 1
0
2
4
6
What type of graph is this?
 A. a bar graph
 B. a pictograph
 C. a line graph
Y-Values
4
3
 D. a scatter plot
2
 E. a stem-and-leaf plot
1
 F. a circle graph
Y-Values
0
0
1
2
3
What type of graph is this?
 A. a bar graph
 B. a pictograph
 C. a line graph
 D. a scatter plot
 E. a stem-and-leaf plot
 F. a circle graph
What type of graph is this?
 A. a bar graph
 B. a pictograph
 C. a line graph
 D. a scatter plot
 E. a stem-and-leaf plot
 F. a circle graph
Homework: page 91
 1. Census or Sample?
 2. Which set of data match the circle graph?
 3. How to interpret the graph to data?
 4. How to use stem-and-leaf plot?
 5. How to display data as a bar graph?
 6. what is the mean, median and mode?