Math-a-Magic – bulk – 100 pieces

This magical trick will turn you into a human computer! Show the 4 long blocks with random single digit numbers. When the blocks are placed side by side, you have four 4 digit numbers. You can instantly figure out the total of the 4 numbers! The blocks can be placed in any combination, but you can deliver the total immediately!
You get 100 sets, each in polybag and 100 instruction sheets