Beacon Lesson Plan Library
Saving Money Through Mathematics
Kenneth Blackman Santa Rosa District Schools
Description
The students compare the cost of energy use for a variety of sources of light. A variety of graphs will be used to make the comparison.
Objectives
The student knows the appropriate operations to solve realworld problems involving integers, ratios, rates, proportions, numbers expressed as percents, decimals, and fractions.
The student solves multistep realworld problems involving fractions, decimals, and integers using appropriate methods of computation, such as mental computation, paper and pencil, and calculator.
The student applies formulas for finding rates, distance, time and angle measures.
The student knows a variety of strategies to estimate, describe, make comparisons, and solve realworld and mathematical problems involving measurements.
The student reads, analyzes, and describes graphs of linear relationships.
The student constructs and interprets displays of data, (including circle, line, bar, and boxandwhisker graphs) and explains how different displays of data can lead to different interpretations.
The student evaluates the hypothesis by making inferences and drawing conclusions based on statistical results.
Materials
Paper
Pencils
Graph Paper
Worksheet
Preparations
Find the cost per Kilowatt Hour for your area.
Copy the worsheet for each student.
Have graph paper available.
Procedures
Day 1:
1. Discuss with the students sources of light and how they are used .
2. Distribute the worksheet to the students.
3. The students will collect data needed to solve the
problems on the worksheet.
4. The students will solve all problems on the worksheet.
Day 2:
1. Divide the students into groups of four.
2. Students will compare the data from their worksheets and draw a multiple line graph comparing energy used by light sources for each person in the group.
3. Each group presents their graphs to the class and compares their graph to other groups.
4. Each student will write a brief summary describing the similarities and differences of household energy consumption and cost.
Assessments
The students will be assessed by the evaluation of the graphs and the worksheet. Students who are having difficulty should receive feedback. As the students are working circulate around the room and observe for discussion and knowledge of how to solve the problems on the worksheet.
Extensions
Local power companies could make a presentation on energy use to the students.
Attached Files
The worksheet for the students File Extension: pdf
