Numbering system teaching aid
OwnerRaymond E. Hildebrandtinventor
Life of this patent
Estimating the term…
Abstract
A teaching aid for teaching young children counting in the tens numbering systems, in which four side by side stacks of nine blocks are each slidable on respective rods held in a frame, each of the nine blocks having one face of each block in the stack imprinted in order with a cardinal number, the blocks in the second, third, and fourth stacks also marked respectively with one, two, and three zeros to the left of the cardinal number appearing thereon. Each of the cardinal numbers on the blocks in each stack are in distinct colors, the zeros color matched to the color of the cardinal number of the corresponding place on the adjacent stack. The blocks in each stack are progressively sized wider to the left in proportion to the number of number and zero digits imprinted thereon.
Claims8
A teaching aid for assisting in teaching counting in the tens number system, said teaching aid comprising:
- a supporting structure;
- a series of stacks of nine blocks, each stack arranged side by side;
- means mounting each of said stack of blocks to said structure so as to be individually slidable and to be spaced apart so as to enable separation of one or more blocks in each stack from the remaining blocks in said stack;
- each of the blocks in a first, rightmost stack bearing in order a respective cardinal number 1-9;
- each of the blocks in a second from the right of said stacks bearing in order a respective cardinal number 1-9;
- a zero imprinted on each of said blocks in said second stack to the right of each of said cardinal numbers thereon.
Dependencies are inferred from the claim text.