Learning Activity 1: GeoGebra (15 minutes)
Description: GeoGebra is a free computer program that uses your web browser to manipulate geometric shapes to model math quickly and accurately. Click the link below and raise your hand if there is any trouble accessing the program (you may have to enable Java).GeoGebra Scale Factor Worksheets:
Worksheet 1
Worksheet 2
Guided Questions:
How could this GeoGebra worksheet on Scale Factor be integrated into Lesson 17?
What connections can be made with the standard equation for proportionality y = kx and the generalizations with the k value of scale factor? For example, if k < 1, k = 1, or k > 1 what occurs?
GeoGebra Proportionality Worksheet:
Worksheet 3
How does the table translate to the points on the graph?
What does the price slider represent in the equation y = kx ?
How can the constant of proportionality be identified in the table? In the graph?
How can the unit rate be identified in the table? In the graph?
Learning Activity 2: LearnZillion Proportionality Reteach (30 minutes)
Background: Based upon our conversations about scholar misunderstandings with identifying and conceptualizing proportionality with graphing and equations, it is my suggestions that you eliminate EngageNY lessons 20-22 (these were optional scale factor lessons that were not high quality) and replace these lessons with these possible topics:
- Mini Lesson on graphing - Scholars have difficulty creating graphs because they do not select appropriate increments for the X and Y axis units. Scholars also have difficulty with identifying dependent and independent variables (labels for X-Axis and Y-Axis).
- Mini Lesson on graphing-to-equations - Since scholars have difficulty creating graphs they have a problem representing a graph as an equation. Scholars should see the connection between representations of graphs, tables and equations.
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