MERLOT Materials

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Interactive exporation of famous curves in the history of Math

The abacus is an ancient tool used for counting, with theRussian version being specifically designed for counting rubles... see more

Official Calculator of the Roman Empire

Touch Pythagoras: The Pythagorean Theorem Interactive. You can change the lengths of the legs (dragging). You can change... see more

This site describes John Napier's life and works and, in particular, his invention known as Napier's Bones. A Java applet... see more

This virtual manipulative from the National Library of Virtual Manipulatives emulates the traditional abacus.