The National Council of Teachers of Mathematics
Illuminations
The Illuminations site includes a large amount of online math manipulatives for grades K-12. Examples of manipulatives include pattern blocks, adjustable spinners, bar grapher, and an equivalent fraction machine.
The website includes a search feature so you can search by grade level and key word. You can also search for lesson plans by grade level and topic and the lessons include use of the online manipulatives. You can also search by specific standards. The manipulatives are really easy to use and move around.
I found this site by searching for online math manipulatives. I currently teach 4th grade and have a Smart Board and I wanted to find manipulatives to use in on it. This site provides a large amount of resources that I’m looking forward to using on my Smart Board.
I think teachers could find this tool very helpful. They could display them on their Smart Boards for a whole group or a small group to interact with. They could also have students use the manipulatives individually on their own computer in the computer lab. They could use the pattern blocks to design a picture, enter data to make a graph, and play one of the games with a partner. This also would be helpful if these particular manipulatives don’t come with your current math program. They are free to use so teachers/schools could save money by not having to order the real manipulatives.
One drawback is that the manipulative/game is small on the screen. If I were able to make changes, I would make it so that you can enlarge the manipulative to fit the entire screen so it would be easier for students to see.
All reviews of this site were extremely positive and had nothing negative to say. Reviews of this site called it a “gold mine” of math resources and said that it will help students develop 21st century math skills.


