In this task, students use Van De Walle's concept of a "nice number" to round a number. This simply means to substitute a ?nice? number that is close so that some computation can be done more easily. The close number can be any nice number and need not be a multiple of ten or one hundred. It should be whatever makes the computation or estimation easier or simplifies numbers sufficiently in a story, chart, or conversation. The lesson begins on page 45 of the PDF file.
In this lesson, students extend their use of dilation to explore similar triangles. Students will be led through an activity using Geometer's Sketchpad, and using their prerequisite knowledge of dilated figures to explore "similar triangles", as will as properties of similar triangles
- Material Type:
- Lesson Plan
- The Mathematics Education Department at University of Georgia
- Doris Santarone
- Date Added: