Birthday Magic - Trick with numbers

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Birthday Magic - Trick with numbers

Aristeo Fernando
Dear Calendar People,
I would like to share with you a trick that I found in ?Childcraft ? The How and Why Library?, Volume 11, page 172.
BIRTHDAY MAGIC
THE TRICK ? Here?s a way to find out the month of a person?s birthday and his age.
HOW YOU DO IT
                  Give a friend a piece of paper and tell him not to let you see what he writes except for the final answer.
                  Ask him to write the number of the month of his birthday, such as 1 for January, 2 for February, 3 for March, and so on up to 12 for December.  Then ask him to multiply the number of his birth month by 2 and add 5 to his answer.  Next have him multiply his last answer by 50, and add his age.  To this total have him add 115, and subtract 365 (the number of days in a year).  He is to tell you his answer.  The first number will be the month of his birthday and the last will be his age.
                  For example, a person who is 10 years old and whose birthday is in March would do this:
Multiply 3 (for March) by 2                    6
Add 5                                               +5
                                                       ----
                                                        11
Multiply by 50                                  x50
                                                    -------
                                                      550
Add his age (10)                              +10
                                                   --------
                                                      560
Add 115                                        +115
                                                  ---------
                                                      675
Subtract 365                                  -365
                                                  ---------
                                                     310                                                              
3 ? month (March), 10 ? age
Do you have other similar tricks?
Best regards,
Aristeo Canlas Fernando, Peace Crusader
Motto:  pro aris et focis
http://www.geocities.com/peacecrusader888/




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Re: Birthday Magic - Trick with numbers

Palmen, KEV (Karl)
Dear Aristeo and Calendar People
 
Please use a fixed width font in any E-mail that relies on horizontal alignment, like I've done below.
 
-----Original Message-----
From: East Carolina University Calendar discussion List [mailto:[hidden email]]On Behalf Of Aristeo Fernando
Sent: 07 December 2005 07:20
To: [hidden email]
Subject: Birthday Magic - Trick with numbers

Dear Calendar People,
I would like to share with you a trick that I found in “Childcraft – The How and Why Library”, Volume 11, page 172.
<!--[if !supportEmptyParas]-->
BIRTHDAY MAGIC
<!--[if !supportEmptyParas]-->
THE TRICK – Here’s a way to find out the month of a person’s birthday and his age.
<!--[if !supportEmptyParas]-->
HOW YOU DO IT
                  Give a friend a piece of paper and tell him not to let you see what he writes except for the final answer.
                  Ask him to write the number of the month of his birthday, such as 1 for January, 2 for February, 3 for March, and so on up to 12 for December.  Then ask him to multiply the number of his birth month by 2 and add 5 to his answer.  Next have him multiply his last answer by 50, and add his age.  To this total have him add 115, and subtract 365 (the number of days in a year).  He is to tell you his answer.  The first number will be the month of his birthday and the last will be his age.
                  For example, a person who is 10 years old and whose birthday is in March would do this:
<!--[if !supportEmptyParas]--> 
Now please rewrite the example in the above font.
 
Karl 

07(15(06 till noon 
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Re: Birthday Magic - Trick with numbers

Peter Zilahy Ingerman, PhD
In reply to this post by Aristeo Fernando
Oh my.

The formula Aristeo gives is
    (2m + 5) * 50 + a + 115 - 365
which expands to
    100m + 250 + a + 115 - 365
which reduces to
    100m + a
which fails for anyone over 99 years of age.

Cute, but no cigar.

Pzed

Aristeo Fernando wrote:
Dear Calendar People,
I would like to share with you a trick that I found in “Childcraft – The How and Why Library”, Volume 11, page 172.
BIRTHDAY MAGIC
THE TRICK – Here’s a way to find out the month of a person’s birthday and his age.
HOW YOU DO IT
                  Give a friend a piece of paper and tell him not to let you see what he writes except for the final answer.
                  Ask him to write the number of the month of his birthday, such as 1 for January, 2 for February, 3 for March, and so on up to 12 for December.  Then ask him to multiply the number of his birth month by 2 and add 5 to his answer.  Next have him multiply his last answer by 50, and add his age.  To this total have him add 115, and subtract 365 (the number of days in a year).  He is to tell you his answer.  The first number will be the month of his birthday and the last will be his age.
                  For example, a person who is 10 years old and whose birthday is in March would do this:
Multiply 3 (for March) by 2                    6
Add 5                                               +5
                                                       ----
                                                        11
Multiply by 50                                  x50
                                                    -------
                                                      550
Add his age (10)                              +10
                                                   --------
                                                      560
Add 115                                        +115
                                                  ---------
                                                      675
Subtract 365                                  -365
                                                  ---------
                                                     310                                                              
3 – month (March), 10 – age
Do you have other similar tricks?
Best regards,
Aristeo Canlas Fernando, Peace Crusader
Motto:  pro aris et focis
http://www.geocities.com/peacecrusader888/




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