Abstract: A calculator to aid in determining cyclic trends of probability inherent in craps playing functions and thereby increase the potential of winning and decrease the threat of losing is disclosed. A first circular relatively stationary frame disc is attached to a second and larger circular sliding disc at their respective centers. The front face of the first circular disc has an indicator thereon and viewing windows therethrough with identifying indicia lying adjacent to each window. The windows are formed into window groupings corresponding to the selected craps playing function. The second circular sliding disc has printed thereon a plurality of carefully disposed scales, each corresponding to information needed for a particular craps playing function. The first of said scales appears along the rim of the sliding disc.

Abstract: A calculator to aid in selecting bingo cards to increase the odds of winning. A fixed frame member has a slide member freely movable relative to it. The front face of the frame has a transverse slot and an indicator. Adjacent the slot, along its length, is an indicia scale made up of the letters BINGO. The slide member has a pluraity of transverse scales, each corresponding to a particular form of bingo game. The scales each have a corresponding indicia, identifying the particular game, which is spaced a distance substantially equal to the distance from the slot to the indicator plus the width of a scale. When an indicia is aligned with the indicator, its corresponding scale is visible in the slot and aligns with the letters BINGO. The numbers of the scale tell which numerals should be chosen under each letter to increase the chances of winning.