Today’s selection, The National Library of Virtual Manipulatives, is an NSF supported project that began a decade ago to develop a library of interactive, web-based virtual manipulatives for the teaching and learning of mathematics.
The tools will not only help those who think in pictures but will also be a novel way for learners to check their work and create concrete models of abstract concepts.
Beware of the spinner with graph tool in the probability section. Once I started playing, I had a hard time stopping!