Use manipulatives to demonstrate that the commutative property holds for addition but not for subtraction 0306.1.9

Links verified on 12/23/2014

1. Activities at Illuminations - Illuminations has 105 online activities available. Select which types of activities you are looking for, and click Search.
2. Base 10 Blocks - virtual manipulative
3. Geometry Board - Use this virtual geoboard to explore geometric concepts of area and perimeter. How many shapes can you makes with a perimeter of 16 units?
4. Integer Bars - learning fractions and more with on-line manipulatives
5. Math Playground - a small but growing collection of manipulatives for teaching and learning
6. National Library of Virtual Manipulatives - select topic and grade level to find appropriate manipulatives
7. Pattern Blocks Program - use tools to solve a variety of problems
8. Tangrams - interactive geometric site
9. Virtual Manipulatives - a list of various manipulatives for grades 1-6
10. Wolfram Demonstrations Project - a free resource of interactive visualizations from elementary education to the frontiers of research

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