I've known about the NLVB (Natural Library of VIrtual Manipulatives) for years but was reminded of it's effectiveness after watching a teacher use it with her students in the computer lab yesterday. Years ago, math teachers were forced to dig out Base 10 blocks or geoboards to provide a visual representation of the math concept being taught. While physical manipulatives certainly still have value in the classroom, the NLVB is a quick, effective way to provide reenforcement in a presentation format that students enjoy.
Check it out - http://nlvm.usu.edu/en/nav/vLibrary.html It's free but they do sell kits which include lessons to use with the site.
On the homepage, NLVB is broken down by grade level, as well as by content. Within each section are dozens of virtual manipulatives that can be moved using the mouse. (Your computer may ask you to download Java, available free at http://www.java.com/en/ before allowing you to see the page).
Besides a valuable classroom and computer learning lab tool, this site could be an excellent homework helper for students confused about an assignment or concept. It's even fun to just play around with.
Check out and feel free to post a comment or question about the site!
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