A friend gave me the bound version of The Bat magazine that has issues 1-50. The opening trick in the first issue of the magazine is an interesting math trick. Basically if you use the number 142857 and multiply it by 1 through 6 you will get the same number, just “cut” like a deck of cards. The sequence is the same, it’s just the starting point isn’t the one (unless 1 is picked).
The trick in The Bat is OK, it uses two stacks of number cards. One is in that order and you false shuffle them, then lay them out as a “random” number. It’s multiplied by a number 1-6 from the other packet and that’s the audience’s number . The first packet is mixed and dealt out and and it matches the audiences number.
It’s an OK, and mathy feeling trick. I think it can be improved a little bit to hide the method. Here’s my idea, you basically do the same trick, however you give them the option to multiply OR divide the two numbers. That’s asked at the beginning. If they choose to divide, you work backwards. you have the number 1-6 picked first, then you use the number 142857 and cut the packet so that it’s in the right order for that number. Divide them and you end up with 142857.
I think the free choices of multiply and a dice roll add layers to the trick that would make it harder to backtrack. Also the dice has less cards in the trick, and could give it more of a “game” feeling. I guess a coin with an X and ÷ could add another prop to the routine. Also with only six outcomes, a multiple out type prediction could work. If you had six dollar bills in your wallet that had the serials numbers each matching an outcome, that could be a fund ending.
I think it’s an interesting math problem, but the challenge is to make it not feel like math.
-Louie