the national library of virtual manipulatives (nlvm) is an nsf supported project that began in 1999 to develop a library of uniquely interactive, web-based virtual manipulatives or concept tutorials, mostly in the form of java applets, for mathematics instruction (k-12 emphasis). the project includes dissemination and extensive internal and external evaluation.
this geometric tool has the reflective quality of a mirror, as well as a transparent quality to provide a fascinating new look at geometry. by placing the mira on any shape, children quickly see concepts of symmetry and congruence. it is also very helpful in studying transformational geometry, as reflections, rotations, slides, and flips are shown easily.
freestanding flip chart features 7-digit place values (ones to millions) on one side, and place value and decimals (thousands to thousandths) on the other