Educational device

Claim 1

IN AN EDUCATIONAL DEVICE INCLUDING A BOARD HAVING AN UPPER SURFACE, THERE BEING A FIRST GROOVE IN SAID BOARD UPPER SURFACE, SAID GROOVE HAVING SPACED LEG PORTIONS AND A BIGHT PORTION CONNECTING ONE OF THE ADJACENT ENDS OF SAID LEG PORTIONS TOGETHER, SAID BOARD UPPER SURFACE BEING PROVIDED WITH A SECOND AND A THIRD GROOVE EACH OF USHAPED CONFIGURATION, SAID SECOND GROOVE BEING PARTIALLY WITHIN AND SPACED FROM SAID THIRD GROOVE, ONE OF THE ADJACENT LEGS OF SAID SECOND AND THIRD GROOVES BEING BETWEEN THE LEG PORTIONS OF SAID FIRST GROOVE WITH THE FREE END OF SAID SECOND GROOVE ONE LEG BETWEEN THE FREE END OF SAID THIRD GROOVE ONE LEG AND AND SAID BIGHT OF SAID FIRST GROOVE, THE OTHER ADJACENT LEGS OF SAID SECOND AND THIRD GROOVES BEING EXTERIORLY OF AND SPACED FROM ONE OF THE LEG PORTIONS OF SAID FIRST GROOVE WITH THE FREE END OF SAID THIRD GROOVE OTHER LEG BETWEEN THE FREE END OF SAID SECOND GROOVE OTHER LEG AND ONE SIDE EDGE OF SAID BOARD IN INVERTED RELATION TO THE FREE END OF ONE OF THE ADJACENT LEGS OF THE FIRST GROOVE, AN EXTENSION ON THE FREE END OF SAID SECOND GROOVE ONE LEG, OTHER EXTENSIONS ON EACH OF THE FREE ENDS OF SAID THIRD GROOVE ONE AND OTHER LEGS, A FIRST GAME PIECE SLIDABLY MOUNTED IN SAID FIRST GROOVE FROM A STARTING POSITION ADJACENT THE FREE END OF THE OTHER OF THE LEG PORTIONS OF SAID FIRST GROOVE TO A FINAL POSITION ADJACENT THE FREE END OF SAID FIRST GROOVED ONE LEG PORTION, A SECOND GAME PIECE SLIDABLY MOUNTED IN SAID SECOND GROOVE FROM A STARTING POSITION AT ONE END OF SAID SECOND GROOVE ONE LEG EXTENSION TO A FINAL POSITION ADJACENT THE FREE END OF SAID SECOND GROOVE OTHER LEG, AND A THIRD GAME PIECE SLIDABLY MOUNTED IN SAID THIRD GROOVE FROM ONE STARTING POSITION AT ONE END OF SAID THIRD GROOVE ONE LEG EXTENSION TO A FINAL POSITION ADJACENT ONE END OF SAID THIRD GROOVE OTHER LEG EXTENSION WHEREBY THE POSITION OF THE FIRST AND SECOND GAME PIECES WILL BE INVERTED TO OCCUPY POSITIONS DIRECTLY ABOVE AND DIRECTLY BELOW ONE ANOTHER WHEN MOVED FROM STARTING TO FINAL POSITIONS, THERE BEING NUMERICAL INDICIA ON SAID FIRST, SECOND, AND THIRD GAME PIECES AND INDICIA ON SAID BOARD UPPER SURFACE REPRESENTING MATHEMATICAL EQUATIONS RELATING TO THE NUMERICAL INDICIA OF SAID GAME PIECES WHEN IN SAID STARTING AND FINAL POSITIONS, THE INDICIA ON SAID FIRST GAME PIECE REPRESENTING A NUMERICAL FRACTION AND THE INDICIA ON SAID SECOND AND THIRD GAME PIECES REPRESENTING NUMERICAL PARTS OF A FRACTION.