The Magic Café
Username:
Password:
[ Lost Password ]
  [ Forgot Username ]
The Magic Cafe Forum Index » » Magical equations » » Help with a "Missing Digit" trick.... (0 Likes) Printer Friendly Version

Pit Boss
View Profile
Elite user
474 Posts

Profile of Pit Boss
Ran across a trick in the book "Magic with Everyday Objects" by George Schindler called "The Missing Number". Spectator writes down a number of several digits, scrambles the same digits, subtracts the smaller from the larger, and then calls out the resulting digits in any order, leaving one digit out. You tell them the missing digit. Can anyone familiar with this tell me how to handle a result such as 9900? If they leave out one of the zeros, the method seems to work. If they leave out one of the nines, it seems to not work. Any help appreciated.
Joe McIntyre
View Profile
New user
New jersey
62 Posts

Profile of Joe McIntyre
Page 163 of" Mathematical magic" by Arthur Benjamin, will be a great help to you on this>
Scott Cram
View Profile
Inner circle
2661 Posts

Profile of Scott Cram
One approach is to tell your audience, "Don't circle a zero, because that's already a circle." (Used here: http://www.digicc.com/fido/) If the rest of the number is a multiple of 9, then they must have circled a 9.

Another approach to is to say something like, "I'm not getting anything yet...heh, it's not a zero, is it?" If they say yes, you can say, "I thought so!" If they say no, you now know it's a 9, and you can say, "I didn't think so." Note that the "It's not a..." phrasing is key to making this approach work.

A few other sources related to this trick:
https://www.youtube.com/watch?v=rbBymb4NU38
https://www.youtube.com/watch?v=td4G09AwQQo
https://pidaymagic.wordpress.com/magic-r......s-grime/

Notice the first link above uses the subtraction approach, while the latter resources use a multiplication approach instead. Harry Lorayne has a 3rd approach (also involving multiplication) for the missing digit trick, which you can find in his book "Mathematical Wizardry" under "The 'Missing Digit'" and/or the June 1995 issue of Apocalypse as "Additions to HaLo's Revenge".
Scott Cram
View Profile
Inner circle
2661 Posts

Profile of Scott Cram
Quote:
On Jan 21, 2017, Joe McIntyre wrote:
Page 163 of" Mathematical magic" by Arthur Benjamin, will be a great help to you on this>


Are you talking about his book "Mathemagics: How to Look Like a Genius Without Really Trying", where it can be found in Chapter 9 under "Missing Digit Tricks"? This book was updated and reprinted as "Secrets of Mental Math", where it can also be found in the "Missing Digit Tricks" section of chapter 9.
Pit Boss
View Profile
Elite user
474 Posts

Profile of Pit Boss
Thank you Joe and Scott. Much appreciated.

JD
Joe McIntyre
View Profile
New user
New jersey
62 Posts

Profile of Joe McIntyre
Yes Scott, that's the one. I apologize for not looking it up.
Slim King
View Profile
Eternal Order
Orlando
16787 Posts

Profile of Slim King
Martin Gardner
THE MAN THE SKEPTICS REFUSE TO TEST FOR ONE MILLION DOLLARS
The Magic Cafe Forum Index » » Magical equations » » Help with a "Missing Digit" trick.... (0 Likes)
[ Top of Page ]
All content & postings Copyright © 2001-2017 Steve Brooks. All Rights Reserved.
This page was created in 0.16 seconds requiring 5 database queries.
The views and comments expressed on The Magic Café
are not necessarily those of The Magic Café, Steve Brooks, or Steve Brooks Magic.
> Privacy Statement <

ROTFL Billions and billions served! ROTFL