Fraction Viewer allows everyone to see and understand parts of a whole easily with color. This revolutionary tool enables students to visualize fractions in simplest form and their equivalences at the same time. The concept of greatest common factor can be easily applied. Students simply move the red disk to add or subtract parts to create sums or differences. Understanding fractional, decimal, and percentage concepts is now accessible to students of all learning styles and levels. Set of 6 disks includes sixths, eighths, ninths, tenths, twelfths, and sixteenths. Grades 3-7.