Abstract: An educational device comprises an outer cylinder and an inner cylinder within said outer cylinder. The inner cylinder has an end extending from the outer cylinder and is rotatable and axially movable with respect to the outer cylinder. The inner cylinder has a series of multipliers (for example) peripherally arrayed around the end extending from the outer cylinder. The outer cylinder includes a series of windows and a series of multiplicands peripherally arrayed around the end from which the inner cylinder extends such that each of the multiplicands can be aligned with each of the multipliers by rotating one of the cylinders. The inner cylinder further includes rows of products physically arranged relative to the windows so that the products do not appear in the windows when the inner cylinder extends from said outer cylinder but do appear in the windows when said inner cylinder is inserted into said outer cylinder so as to display the product of the selected multiplier and multiplicand.

Abstract: An educational device for teaching beginning readers how to read includes three independently rotatable discs. The first disc includes a series of word families; the second disc contains a series of word family windows through any of which any of said word families can be viewed, and an initial sound printed adjacent each of said word family windows; and the third disc contains a word window through which a complete word (i.e., an initial sound and word family) can be viewed, and an initial sound window through which one of said initial sounds can be viewed before the complete word is formed in the word window.