Arithmetic concepts display board

Claim 1

A mathematics concept display device comprising a display board, a plurality of parallel vertical ridges, a plurality of parallel horizontal ridges, the ridges of each direction being equally spaced to divide the board surface into a grid of equal squares, a number in each of the squares of one marginal row of squares, a number in each of the squares of the adjacent oppositely extending marginal row of squares, said numbers in each row being consecutive, a central peg, a plurality of pegs, one rising from each of several of the ridge intersections, a plurality of lesser pegs defining a circle on the board centrally thereof, about the central peg, at least one indicia piece having a cavity such that the piece is adapted to seat on the board about a lesser peg, at least one flexible strand adapted to fit about a plurality of pegs to define a geometric entity adjacent the grid, a horizontal and a vertical axis on the board intersecting at the midpoint of the board, and positive and negative numbers extending from the point of intersection in conventional ordinate fashion imposed on the grid adjacent the axes.