Abstract:
An educational card game designed to develope mathematical abilities, to perform various combined operations by dealing cards to each player and selecting at random a card designating the number that must be calculated from the card numbers of each players hand; wherein a timing device is provided to deal out the cards.

Description:
BACKGROUND OF THE INVENTION 
     The instant invention relates generally to games and more specifically it relates to an educational, mathematical card game; that involves use of various mathematical operations to calculate a specific number on a randomly picked card. 
     Numerous games have been provided in prior art that are adapted to utilize playing cards to carry out arithmetic operations which would not be suitable for the purpose of the present invention as described hereinbelow which also involves a novel means for card selection. 
     SUMMARY OF THE INVENTION 
     A principle object of the present invention is to provide an educational card game that allows each player to use mathematical operations of adding, subtracting, multiplying, dividing, extracting roots, logarithmic computations, etc. 
     Another object is to provide an educational card game that uses a deck of specially numbered cards that can be played by any number of people of any age and level of mathematical proficiency. 
     An additional object is to provide an educational card game that contains a timing device that is activated by a calculate number card when removed therefrom, which makes the game more interesting by imposing pressure of time on each player. 
     A further object is to provide an educational card game that is economical in cost to manufacture. 
     A still further object is to provide an educational card game that is simple and easy to use which developes logical skills and ability to perceive maximum mathematical combinations. 
     Further objects of the invention will appear as the description proceeds. 
     To the accomplishment of the above and related objects, this invention may be embodied in the form illustrated in the accompanying drawings, attention being called to the fact however, that the drawings are illustrative only and that changes may be made in the specific construction illustrated and described within the scope of the appended claims. 
    
    
     BRIEF DESCRIPTION OF THE DRAWING FIGURES 
     FIG. 1 is a perspective view of a deck of cards used in playing the game. 
     FIG. 2 is a perspective view of a timing device used in playing the game. 
     FIG. 3 is a cross sectional view taken along line 2--2 in FIG. 2. 
     FIG. 4 is a side view with parts broken away as indicated by arrow 3 in FIG. 1 showing how the top calculate number card enters the slot in the housing to be manually pulled out to set the arrow indicator. 
     FIG. 5 is a cross sectional view taken along line 4--4 in FIG. 3 showing the gear wheel and time gear in engagement. 
     FIG. 6 is a perspective view of the top calculate number card and card gear in engagement. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Turning now descriptively to the drawings, in which similar reference characters denote similar elements throughout the several views, FIG. 1 illustrates a deck of cards 10 used in playing the educational card game. The uppermost card 12 carries numerical indicia 14 on the uppermost lateral surface 16. Other cards, shown below card 12, carries similar indicia on their uppermost surfaces, comprising the remaining cards 18 of the deck 10. The numerical indicia 14 can be whole, fractions, negative and/or positive. 
     The game is played as follows: A first player receives several cards (three or more) from the deck 10 with certain numerical indicia 14 upon them to form a hand. Another player gives the first player a calculate number card or the first player can take the calculate number card from the deck 10. A player by using a maximum of the cards in his hand must calculate via a mathematical operation, such as adding, subtracting, multiplying, dividing, root extraction, etc., the number on the calculate number card. 
     For example, the first player receives five cards from the deck 10 with the numerical indicia 14 being &#34;2&#34;, &#34;5&#34;, &#34;5&#34;, &#34;7&#34; and &#34;11&#34; for his hand. The calculate number card has the numerical indicia &#34;14&#34; upon it which the first player must now calculate from his hand. 
     He can use three cards: &#34;2&#34;, &#34;5&#34; and &#34;7&#34;, (2+5+7=14). He can use four cards: &#34;2&#34;, &#34;5&#34;, &#34;5&#34; and &#34;11&#34;, ##EQU1## He can use five cards: &#34;2&#34;, &#34;5&#34;, &#34;5&#34;, &#34;7&#34; and &#34;11&#34; (11×7=77, 5+2=7, 77-7=70 and 70÷5=14. The object of the game is to use as many cards as possible. The player using the most cards wins. 
     The educational card game can be played by any number of people or it can be played by a single player. Calculation may be performed with or without a calculator. 
     To make the educational card game more interesting, a timing device 20 shown in FIGS. 2 thru 6 is provided. It imposes pressure of time on each player such as would be when taking an examination. The timing device 20 is activated by a calculate number card 22 that is manually pulled out from the timing device. 
     The timing device 20 consists of a box-like housing 24 that has a finger grip slot 26 in one side wall 28 and a transparent top 30. A spring biased platform 32 is within the housing 24 and located on bottom floor 34 to hold a plurality of the calculate number cards 22. 
     A cam 36 is formed within the housing 24 on another side wall 38 opposite the finger grip slot 26 so that the top calculate number card 22 will be properly positioned at the finger grip slot. 
     A gear assembly 40, being a gear wheel 42 and a time gear 44, is rotatably mounted within the housing 24 above the calculate number cards 22. Each calculate number card has a rack 46 formed on one edge. 
     A pinion 48 is rotatably mounted in the housing 24 to engage with the rack 46 on uppermost calculate number card 22. The pinion 48 drives the gear assembly 40 when the uppermost calculate number card is manually pulled out through the finger grip slot 26 in the housing 24. 
     A spring biased arrow indicator 50 with dial 52 is mounted within the transparent top 30 of the housing 24. The arrow indicator 50 is driven by the gear assembly 40 to set time on the dial 52. 
     A spring biased door 54 is mounted to the housing 24 so that access within the housing is possible to reload the calculate number cards 22 and adjust the gear assembly 40 when needed. 
     While certain novel features of this invention have been shown and described and are pointed out in the annexed claims, it will be understood that various omissions, substitutions and changes in the forms and details of the device illustrated and in its operation can be made by those skilled in the art without departing from the spirit of the invention.