Abstract: An arithmetic teaching device including a base plate bearing a table with numerical indicia and a cover plate secured atop the base plate. The cover plate is provided with a number of slots configured to permit the numerical indicia in the table to be viewed through the slots. A number of slides are positioned in the slots between the base plate and the cover plate, each of the slides has a length about half that of the slots.

Abstract: An arithmetic teaching device including a base plate bearing a table with numerical indicia and a cover plate secured atop the base plate. The cover plate is provided with a number of slots configured to permit the numerical indicia in the table to be viewed through the slots. A number of slides are positioned in the slots between the base plate and the cover plate, each of the slides has a length about half that of the slots.

Abstract: An educational tool including a rigid frame supporting a pair of parallel rods. A number of beads of equal width are slidably positioned on one of the rods. A reckoning slide is slidably and rotatably positioned on the other of the rods for counting the beads. The reckoning slide has a front side and a rear side, either of which may be selectively brought into view by rotating the reckoning slide. The front side has printed indicia in the form of a first whole number sequence increasing from left-to-right and the rear side has printed indicia in the form of a second whole number sequence increasing from right-to-left.