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The Magic Cafe Forum Index » » Magical equations » » Reveals from a single number (2 Likes) Printer Friendly Version

barneyS
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Virginia
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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
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Germany
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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 * Im Schattenreich der Spielkarten * Si Stebbins Pro * Gregorian Calendar Sheets for Years 1582 - 2399 * http://www.lybrary.com/dr-hanschristian-solka-m-4881.html?osCsid=20c4748547092ea41fb8ae02a2dcf0fd
hcs
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Germany
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A similar trick is the revealing of a birthday - month, day and year.
Low Vision Marking System * Im Schattenreich der Spielkarten * Si Stebbins Pro * Gregorian Calendar Sheets for Years 1582 - 2399 * http://www.lybrary.com/dr-hanschristian-solka-m-4881.html?osCsid=20c4748547092ea41fb8ae02a2dcf0fd
Paradise
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sheffieldEngland
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Quote:
On Oct 11, 2017, hcs wrote:
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)



Smile
barneyS
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Virginia
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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
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Germany
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Thank you very much for your kind words!
Low Vision Marking System * Im Schattenreich der Spielkarten * Si Stebbins Pro * Gregorian Calendar Sheets for Years 1582 - 2399 * http://www.lybrary.com/dr-hanschristian-solka-m-4881.html?osCsid=20c4748547092ea41fb8ae02a2dcf0fd
Sixten
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Inner circle
Floral Park, NY, U.S.A.
3673 Posts

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(A tiny correction)

Subtract secretly 250:
732-250=482 (#P/#F/#PH)

& Thank You, hcs! Smile
hcs
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Germany
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Sixten, thank you very much for your carefully reading!
Low Vision Marking System * Im Schattenreich der Spielkarten * Si Stebbins Pro * Gregorian Calendar Sheets for Years 1582 - 2399 * http://www.lybrary.com/dr-hanschristian-solka-m-4881.html?osCsid=20c4748547092ea41fb8ae02a2dcf0fd
Sixten
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Floral Park, NY, U.S.A.
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Smile
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