

barneyS New user Virginia 28 Posts 
Hi,
I enjoy doing arithmetically/geometrically based magic tricks for smart/knowledgeable kids (and their parents) at STEM events and Maker Faires. This is all volunteer. The best arithmetic tricks I have involve having the spectator do some arithmetic, under guidance, then tell me a final number that they get. From this I am able to tell them the number that they originally thought of. I try to give an interesting presentation so that the trick isn't just "Think of a number, do some arithmetic, and now the number you thought of was ..." but related in some way to something else. I've read a number of books (Martin Gardner's, William Simon's) and watched some Rick Lax videos on the net. So far, all of the methods in which the spectator reveals a single number lead to the reveal of one or two things. Examples would be a number that the mag wrote down early in the trick, the two values on a pair of dice, etc. Can someone point me to a trick, along these lines, where a single number provided by the spectator will allow a reveal of THREE items? I invented one and have tried it on my friends where it has worked (and they are puzzled about how I did it) but my current presentation is a little boring. I hope to fix that over time. If you know of a book, DVD or YouTube video that has a reveal of 3 items from one number I'd appreciate the pointer! Barney 
hcs Loyal user Germany 270 Posts 
To reveal a person, a finger and its phalanx:
The persons (#P) are numbered from 1 to ... The 10 fingers (#F) are numbered from 1 (little finger, left hand) to 10 (little finger, right hand) The 3 phalanxes of a finger (#Ph) are numbered from 1 to 3 One selected person wears the ring on a selected finger on a selected phalanx. You are able to reveal person, finger and phalanx, calculating: 1. #P x 2 2. + 5 3. x 5 4. + #F 5. x 10 6. + #Ph 7. = ? Example: person #P=4 right middle finger #f=8 second phalanx #Ph=2 1. 4 x 2 = 8 2. + 5 = 13 3. x 5 = 65 4. + 8 = 73 5. x 10 = 730 6. + 2 = 732 Subtract secretly 250 732  250 = 582 (#P/#F/#Ph)
Low Vision Marking System * Melencolia  A shrewd and unforgettable method for a 4x4 magic square * https://www.lybrary.com/melencoliap921956.html

hcs Loyal user Germany 270 Posts 
A similar trick is the revealing of a birthday  month, day and year.
Low Vision Marking System * Melencolia  A shrewd and unforgettable method for a 4x4 magic square * https://www.lybrary.com/melencoliap921956.html

Paradise Veteran user sheffieldEngland 399 Posts 
Quote:
On Oct 11, 2017, hcs wrote: 
barneyS New user Virginia 28 Posts 
Thanks hcs, I appreciate the thought! You multiply by 10 twice and then add the 3rd number so that each occupies one place in the number (after a necessary subtraction).
My version has only one hidden multiplication by 10 (5, then 2) and I multiply after the final addition, just to obscure the problem as much as possible. There is no subtraction. My plan was to give a short talk on my method at next April's Gathering 4 Gardner in Atlanta, though I don't know if they would want to make program space for such a simple thing. And, finally, Paradise: I didn't see any post under your name besides the quote of the hcs method. Do you want to repost? 
hcs Loyal user Germany 270 Posts 
Thank you very much for your kind words!
Low Vision Marking System * Melencolia  A shrewd and unforgettable method for a 4x4 magic square * https://www.lybrary.com/melencoliap921956.html

Sixten Inner circle Floral Park, NY, U.S.A. 3784 Posts 
(A tiny correction)
Subtract secretly 250: 732250=482 (#P/#F/#PH) & Thank You, hcs! 
hcs Loyal user Germany 270 Posts 
Sixten, thank you very much for your carefully reading!
Low Vision Marking System * Melencolia  A shrewd and unforgettable method for a 4x4 magic square * https://www.lybrary.com/melencoliap921956.html

Sixten Inner circle Floral Park, NY, U.S.A. 3784 Posts 

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