Miss M. Carmelle Nesbitt • 7th Grade Math • Friday, July 2, 2010 • Per: 4
Circle Graphs
Objectives:
· TSW interpret data represented on a circle graph (DOK 2-3, 5a)
Materials:
· Pencil and paper, LCD projector, computer w/ PowerPoint, dry erase markers, erasers, “thinking caps”
Bell Ringer: (7 min)
· True or False?
1. In your own words, define a histogram. When is it used? Why is it important?
2. Favorite color:
o Red, Blue, Green, Yellow, Pink
3. Favorite dessert?
o Cake, Brownies, Ice cream, Cookies
4. Favorite subject?
o Math, English, science, social studies
5. Favorite rapper?
o Flocka, Wayne, Gucci, Yo Gotti, TI
6. Favorite food?
o Pizza, hot wings, nachos, mac and cheese, cheeseburgers
* Expectations Slide*
Set: (5 min)
· Favorite color, dessert, subject, rapper, food discussion.
o Write #s on board
· What would be one way to represent this data? What type of graph would help us to see each individual part of the whole?
· “Today we will be learning how to gather, organize, and display data using pie graphs.”
Procedure: (25 min)
· Can anyone tell me what a pie graph is or what it looks like? What’s another name for a pie graph?
o Pie graphs show the relationship of parts of a whole and the entire circle is considered as the whole.
§ Represent data in a visual, easy to read manner, which helps us understand data more clearly.
§ Even though different pieces may be used, all pieces together must equal one whole or 100%.
· TTW explain the parts of a pie graph.
o Each slice represents a part of the whole
o We determine how large each slice should be by using proportions, fractions, and percentages.
· Review Fractions
o Numerator = parts, denominator = whole (total number of pieces)
§ Examples- ½, ¾, 9/10,
· How many TOTAL parts?
· How many parts shaded?
§ IP- Express the following pie graphs as fractions. (4 min)
o To express percentages as a fraction—place over 100. ALWAYS. (simplify)
§ IP- express the following percentages as a fraction. (simplify)
· Let’s put that knowledge together.
o Here’s another example— Carmelle surveyed the 30 students in her class about their favorite foods. How many preferred comedy?
o How many students preferred comedy?
§ Set up a proportion.
· Part/whole = %/100
o We are looking for the PART of the class that liked comedies.
· TTW make fractions for data collected from class.
o Which category will be the largest slice? Smallest?
o Let’s figure out percentages and display on our circle graphs.
§ Make circle graph from data collected from class
· You say, I say Game (if time permits)
o Add -2, Multiply by -1, Multiply by -3, Add 10, Multiply by 3, add 4
Closure (5 min)
· Today we learned how to interpret data represented on a circle graph
o What is a circle graph?
o What number is a percentage ALWAYS placed over when expressing as a fraction?
o The numerator represents what? The denom?
· 3 things learned - front…still confused - back.
· Next week, Mr. Sedlacek and Mr. Doar will teach you more about interpreting graphs.
Assessment/Evaluation:
· TSW interpret data represented on a circle graph
o Formal: TTW administer a written test (M) including interpreting data represented on a circle graph (C), which will be graded and recorded using Engrade (D).
o Informal: TTW monitor students (M) to gauge their understanding as they respond to questions verbally and via worksheets(C).