University of Colorado
University of Colorado: Ph Et Interactive Simulations: Estimation
Explore size estimation in one, two and three dimensions! Multiple levels of difficulty allow for progressive skill improvement.
University of Colorado
University of Colorado: Ph Et Interactive Simulations: Area Builder
Create shapes using colorful blocks, and explore the relationship between perimeter and area. CCSS.Math.Content.3.MD.C.7.a Find the area of a rectangle with whole-number side lengths by tiling it