# BOB FRIEDHOFFER
**BIRTHDAY CARD TRICK INSTRUCTIONS **
**ROUTINE AND EFFECT:**
Have a spectator merely think of a family member or friend whose age is
between 1 and 63. They must know the age of that person. Point to the
individual cards, one at a time and ask, "Is the age of the person that
you are thinking about on this card?" After examining all six cards, you
tell them the age of the person.
**SECRET METHOD:**
If they say, "No, the age is not on the card", do nothing and go on to
the next card. For the cards that they say "Yes!" You must keep a silently
remembered, running total, of all of the numbers in the upper left-hand
position of those cards. The total sum that you silently arrive at, after
they look at all six cards, will be the age of the person, of whom they
are thinking.
**EXAMPLES: **
If the age the select is 22. That number (22) only appears on the following
cards:
- The card with 16 in the upper left hand position
- The card with 2 in the upper left hand position
- The card with 4 in the upper left hand position.
- 16 + 2 + 4 = 22
If they select 61, the number 61 appears on the following
cards:
- The card with 16 in the upper left hand position
- The card with 8 in the upper left hand position
- The card with 1 in the upper left hand position
- The card with 4 in the upper left hand position
- The card with 32 in the upper left hand position
- 16 + 8 + 1 + 4 + 32 = 61
NOTE: If you look at the numbers in the upper left hand
corner of each card, you will see that they run in a sequence, if you
order them. The sequence is - 1, 2, 4, 8, 16, 32. By adding these numbers
together in different combinations (and permutations) you can arrive at
any number between 1 and 63.
Follow this link to
print out your own Birthday Cards to perform this trick at home.
rfriedhoffer@gc.cuny.edu information@sciencetrix.com |