1950's Flash Wheel mathematics teaching aid. At the clever size/dimensions of an LP record, this vintage educational tool works by turning the wheel on the right side to a math Division equation and then pulling out the "magic slide" on the left to reveal the answer. Flash Wheel is two-sided with 45 equations on each side (total of 90). Wheel is in worn vintage condition, but works and display very nicely with its wonderful 50's era typography and illustrations.. Measures 12.25" x 12.25".