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4434Famous Curves (Math)
http://www.merlot.org/merlot/viewMaterial.htm?id=74493
Interactive exporation of famous curves in the history of MathAbacus
http://www.merlot.org/merlot/viewMaterial.htm?id=74447
counting is funNLVM Abacus
http://www.merlot.org/merlot/viewMaterial.htm?id=86520
This virtual manipulative from the National Library of Virtual Manipulatives emulates the traditional abacus.The Russian Abacus
http://www.merlot.org/merlot/viewMaterial.htm?id=88468
The abacus is an ancient tool used for counting, with theRussian version being specifically designed for counting rubles and kopeks. The simple design uses a set of framed rods and a series of beads that are moved back and forth across the rods to conduct the count.Abacus Java
http://www.merlot.org/merlot/viewMaterial.htm?id=83982
This site is a java based abacus applet where you can set up how many rows you want, where you want to put the decimal, what number base system you want, and even what countries style of abacus you want displayed. If you go to the menu you will find more options such as roman numerals and a pretty good demo.Compvter Romanvs
http://www.merlot.org/merlot/viewMaterial.htm?id=74466
Official Calculator of the Roman EmpireTouch Pythagoras App for Android
http://www.merlot.org/merlot/viewMaterial.htm?id=767101
Touch Pythagoras:The Pythagorean Theorem Interactive.You can change the lengths of the legs (dragging).You can change the length of the hypotenuse with two fingers.You can zoom (pinch zoom) and rotate the figure (dragging).There are 6 ways to view the Pythagorean theorem.- Unit surfaces.- Two equivalent square containing the same surface.- The square for each leg in the square of the hypotenuse (Euclid)- Pingi - Dudeney proof.- Da Vinci.- Bhaskara reasoning.This is a free appUndusting Napier's Bones
http://www.merlot.org/merlot/viewMaterial.htm?id=82791
This site describes John Napier's life and works and, in particular, his invention known as Napier's Bones. A Java applet illustrates how the "bones" work when multiplying numbers.