National Library of Virtual Manipulatives NLVM is a library of uniquely interactive, web based virtual manipulatives or concept tutorials, which are mostly in the form of Java applets. It caters to the needs of manipulatives from grades Pre-K to 12. There is an ever growing emphasis on the use concrete materials, i.e., Manipulatives, for teaching and learning of mathematics in the classroom. But we can't expect parents to buy these to use with their children at home. Students can access these virtual manipulatives at home, and teachers can use these with white boards.
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McGraw Hill Manipulatives There are a variety of manipulatives for Pre-K to grade 8. These are very simple to use on the whiteboards. Use the sidebar menu on the left to chose the grade, then work-mats from the backgrounds, and the manipulatives you need for your lesson. You can drag and drop tools like pen, line, hand, ruler, protractor, stopwatch, timer etc. You can even print screen to create worksheets.
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Fraction Calculator This is a link to this single tool, a faction calculator, that the teachers and students will love to use. Teaching and learning operations involving fractions can be very challenging. You can learn to add, subtract, multiply and divide fractions using this single tool.
Seeing the fractions in numbers and drawing facilitates understanding of the concept.
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Primary Interactives Primary Interactives is a quick way to find a visual representation to teach and learn new math concepts for primary students. Swinging Teddy is quite an interesting way to represent odd and even numbers. There are some simple drills like Missing Numbers. Some manipulatives can be used in junior classrooms too, i.e., Rotation, Reflection, Guess the Random Angle etc. Although the coin and money games use U.K. currency (pounds and pence), they are still relevant to use in any classroom. One can make the connection that different countries have different currencies, but the counting does not change. Lastly, the interactives are not limited to Math as you can use this for other subjects too.
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Math Playground Math playground is a website that hosts a variety of resources for learning of math, including virtual manipulatives. It is free to use, and is user friendly. There are manipulatives to learn about transformations, fractions, percentage, algebra equations, probability, function machines, fraction and decimal balances, along with versatile geo-boards and pattern blocks etc. The Spirograph will hook you for a long time as you can use innumerable equations to draw designs.