Activity
1.
At the beginning of class review yesterday’s
lesson and the homework from the lesson on scatter plots
and line graphs. Allow the students time to discuss the
differences they find in their work. Tell them, “We
will come back to all the types of graphs we have covered,
but today we are going to look at one more type of graph,
the pie graph.”
2.
Ask the students, “What
do we use pie graphs for? How are they different from
the other graphs?”
3. Put up the first page of Pie Chart overhead (Race/Ethnicity
% of US Public Schools from
http://nces.ed.gov/nceskids/graphing/ ) Using this pie graph ask students what are the advantages
and disadvantages of using a pie chart over other types
of graphs. (see teacher background). As student respond
write the advantages and disadvantages on the board.
4. Go over the questions, but realize that it is not possible
to answer the last one because without knowing the total
number of students we cannot figure out how many students
are in that sector of the pie.
5. Put up the Making a Pie Chart overhead (from the following
website
http://bdaugherty.tripod.com/KeySkills/pieCharts.html )
and go through the calculations with the students. They
will need help calculating the size of the angle. (This
is a good time to review setting up and solving proportions).
However, have the students make their own pie chart as
they will probably need practice measuring angles with
a protractor.
6. Put up the Sausage-Mushroom Pizza overhead (from the
website http://www.mathleague.com/help/data/data.htm )
and help the students calculate the weight of each of the
individual components of the pizza.
Homework
Students should do the problems on the attached Homework
sheet.
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