DETAILED DESCRIPTION What is claimed is: 1.
A teaching aid for mathematics comprising: a.
a baseboard with a plurality of intersecting rows of spaces each space being common to one vertical and one horizontal row, b.
a plurality of tiles being the same size as the spaces on the baseboard, c.
The tiles of one set bearing numerical designation including the following: whole numbers, negative numbers, fractions, decimals, squares of numbers, cubes of numbers, higher powers of certain numbers, square roots of numbers, cube roots of numbers, the variables x,y,z, the imaginary number i, d.
the tiles of the second set bearing function designation including, + plus, - minus, .
times.
multiplication, .
div.
division, / the fraction bar, e.
the tiles of the third set bear the equals sign =, f.
a wet of instructions for playing a game whereby, said tile are placed n said baseboard to form linear equations that intersect at right angles sharing one of said tiles in common.
Description:
BACKGROUND--FIELD OF INVENTION This invention relates to an educational aid for mathematics, specifically to an aid for recognition of numerical and functional equivalents and spatial relationships.
BACKGROUND--DESCRIPTION OF PRIOR ART Boards upon which cards bearing numbers and functions could be arranged to show the problem and solution of a simple linear equation have been used as a teaching aid.
Various designs of a frame to hold cards marked with whole numbers, functions and equals to perform a single mathematical step of the form A+B=C have been patented.
The focus of the art has been primary education.
The following designs are of this type, U.
S.
Pat.
No.
4,808,111 to Pratt (1989) which discloses a base plate or board with inserts.
The inserts and recesses including corresponding notches so that inserts can fit into the recesses.
U.
S.
Pat.
No.
4,884,973 to Pak (1989) discloses cards with holes and a board with pegs upon which the cards can be alined.
U.
S.
Pat.
No.
5,040,987 to Frazier (1990) discloses notches to align the cards on the board for numbers and inserts that fit into recesses for the functions
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Exercise Devices2 
