Patent Document ID: 4078318
Application ID: 05683196
Patent Flag: 1

Claim One:
1. An educational device comprising: means for teaching addition, subtraction, multiplication, and division including; a main support body structure, changeable means on said main support body structure for indicating the type of math problem and function to be performed, other means associated with the main support body structure for physically stacking a known quantity of object members vertically on each other to represent a known quantity for the math function to be solved, and further means in contact with the stacked object members due to gravity action only and as aligned with the changeable means to indicate the correct answer to the math problem, said changeable means including a card replaceably mounted on the main support body structure, said card having indicia thereon to indicate the math problem and function desired to be performed, the other means including a plurality of similarly shaped object members stackable vertically on the main support body structure, and vertical alignment and positioning means on the main support body structure to keep the said shaped objects in orderly stacked form, said further means including a single lever only mounted for pivotable movement from one end of the main support body structure, said lever extending substantially the length of the main support body structure and with a mid-point thereof freely engageable with the top of the stack of shaped object members, and with the other end of the lever pointed to align with and indicate the correct answer as provided on the replaceable cards as mounted on the main support body structure.