Use manipulatives to demonstrate that the commutative property holds for addition but not for subtraction

(0306.1.9)

Links checked 5-9-09

1. Activities at Illuminations - Illuminations has 100 online activities available. Select which types of activities you are looking for, and click Search.
2. Base 10 Blocks - virtual manipulative
3. Electronic Examples - index of manipulatives from NCTM
4. GeoBoard - this two-part example describes activities that use interactive geoboards
5. Integer Bars - learning fractions and more with on-line manipulatives
6. Math Playground - a small but growing collection of manipulatives for teaching and learning
7. National Library of Virtual Manipulatives - select topic and grade level to find appropriate manipulatives
8. Pattern Blocks Program - use tools to solve a variety of problems
9. Tangrams - interactive geometric site
10. Virtual Manipulatives - a list of various manipulatives for grades 1-6
11. Wolfram Demonstrations Project - a free resource of interactive visualizations from elementary education to the frontiers of research