Hundreds Boards and Manipulatives, model 1-03105-00, is a math training device designed for use by students who are blind or have low vision. It consists of two desk-size boards made of heavy plastic, the Grid Board and the Number Board, and hundreds of manipulative pieces. The Grid Board has a raised-line ten by ten grid with blank squares to which manipulatives can be attached. The Number Board also has a raised-line ten by ten grid, but its squares are preprinted with the numbers one through 100 in large print and Nemeth braille. This board serves as a reference to check work placed on the Grid Board, and can also be used for concept demonstration. The of manipulative pieces included with this set are made of tough plastic and backed with loop material for attaching to the Grid Board. There are two kinds of manipulatives: Numbers (one through 100) and four shapes. COLOR: The Grid Board is black. The Number Board is yellow with black raised grid lines and black numbers. Manipulatives are white, yellow, red, blue, and black, with numbers in contrasting colors.