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4434National Library of Virtual Manipulatives
http://www.merlot.org/merlot/viewMaterial.htm?id=76833
Large collection of platform independent, interactive, java applets and activities for K-12 mathematics and teacher education.Eye Opener Series
http://www.merlot.org/merlot/viewMaterial.htm?id=75011
A collection of Java applets - math puzzles and problem illustrations - that open eyes, each for its own reason.Visual Fractions
http://www.merlot.org/merlot/viewMaterial.htm?id=83266
The purpose of Visual Fractions is to picture fractions and the operations on them.NLVM - Factor Tree
http://www.merlot.org/merlot/viewMaterial.htm?id=83372
This manipulative allows you to construct factor tree(s) of prime factors for one or two numbers, and then from the prime factorization of two number, you are asked to identify the Least Common Multiple (LCM) and the Greatest Common Factor (GCF) of the two given numbers using a Venn Diagram.Walter Fendt's Mathematics Applets
http://www.merlot.org/merlot/viewMaterial.htm?id=91208
A large collection of applets designed to demonstrate basic mathematics. Many foreign-language versions available.Old Egyptian Fractions
http://www.merlot.org/merlot/viewMaterial.htm?id=720775
Old Egyptian Fractions at MathCats(Web and android version)Old Egyptian Math Cats knew fractions like 1/2 or 1/4 (one piece of a pie).But to make fractions like 3/4, they had to add pieces of pies like 1/2 + 1/4 = 3/4.Old Egyptian Math cats never repeated the same fraction when adding.They never wrote: 1/4 + 1/4 + 1/4 = 3/4How it works:Choose puzzles from the list on the top. ( * = easier, **** = very hard.)Add 2 or 3 fraction pieces below.After you find one solution, the puzzle is marked "Solved." Can you find more solutions? (Click to see them listed on the bottom.)There's the android version in the mirror site linkMathway
http://www.merlot.org/merlot/viewMaterial.htm?id=784784
Mathway is a mathematics problem solving tool where students can select their math course - Basic Math, Pre-Algebra, Algebra, Trigonometry, PreCalculus, Calculus or Statistics and enter a problem. The computer solves the problem and shows the steps for the solution. It also has a worksheet generator.Abacus
http://www.merlot.org/merlot/viewMaterial.htm?id=74754
Complete sim of an abacus, and it even translates the bead positions into a numerical representation. Includes tutorials on adding and subtracting with an abacus, as well as info on the history and cultural background of the tool. Source code freely available.Pattern Blocks
http://www.merlot.org/merlot/viewMaterial.htm?id=79962
A pattern block editor, allowing students to create pictures with the standard block shapes. Can color the shapes, background, save to a gallery for sharing, and email your creations.Abacus
http://www.merlot.org/merlot/viewMaterial.htm?id=74447
counting is fun