1) Estimator Virtual Manipulative This activity features an applet that presents three estimating situations. Problems challenge students to estimate the number of objects on the screen or estimate the length of a curve or area of a shape.
13) Relating Area and Perimeter Virtual Manipulative Click Skip Intro, then select Lessons, and then click on Lesson 13 for a lesson on the relationship between area and perimeter of rectangles. Learn how to maximize the area and minimize the perimeter. You can also minimize area and maximize perimeter.
14) Exploring Composite Figures Virtual Manipulative Click on Grade 7, then click on Area and Perimeter and go to…
Exploring Composite Figures
Create composite figures made of several geometric shapes and determine their areas. You can also view an interactive video: “Exploring Area and Perimeter” at this web site.