National Library of Virtual Manipulatives - 1 views
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Trisha Sharp on 06 Mar 09This site is broken down into the five main math standards and from there, it breaks it down into grades. These are excellent virtual manipulatives that students can use online. They are organized neatly and each one has directions on how to use them. Some of them are more confusing than others, but well worth it. My kids love using them.