University of Cambridge
University of Cambridge: Nrich: Napier's Bones
Use this one page website to learn how to multiply and divide a "new" way. This method was invented over 400 years ago by John Napier. A detailed explanation is only a click away.
Khan Academy
Khan Academy: Repeated Addition
In this exercise, students practice repeated addition. Students receive immediate feedback and have the opportunity to get hints, watch a tutorial video, and try questions repeatedly.
GeoGebra
Geo Gebra: Area Model: Multiplying Fractions
Explore this interactive to visualize what it means to multiply two fractions together. Use the sliders to change the numerators and denominators and move one fraction bar image on top of the other. The product is represented by the area...