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IGNITE – Fun with Math. J. Sriskandarajah AMATYC Conference Anaheim, October 31, 2013 [email protected] Super Computation. Think of a 3 digit number, say 270 The final answer, adding four more three digit numbers to 270 is 2268?

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Ignite fun with math

IGNITE – Fun with Math

J. Sriskandarajah

AMATYC Conference

Anaheim, October 31, 2013

[email protected]


Super computation
Super Computation

  • Think of a 3 digit number, say 270

  • The final answer, adding four more three digit numbers to 270 is 2268?

  • Ask the audience for another 3 digit number, say 581 and you include (the ninth complement) 418.

  • Ask for one more 3 digit number, say 936 and you include 063 as your last number.

  • 270+581+418+936+063 = 2268! Wow!!


Predicting birthday mind reading mind boggling
Predicting birthday!Mind Reading/Mind Boggling!!


Volunteer is asked to point out the tables in which the day of the month he or she was born. The predicted birthday is obtained by adding the entries in the second row, fourth column of the selected tables.


Become a psychic age by dining out
Become a psychic! of the month he or she was born. The predicted birthday is obtained by adding the entries in the second row, fourth column of the selected tables.Age by dining out?

  • The number of times a week you would like to dine out (0-7)

  • Times by 2 then add 5

  • Now multiply by 50

  • If you have already had your birthday this year add 1763, else add 1762

  • Subtract the year you were born

  • Last two digits your age and the leading digit is the number of times you plan to dine/week!


Significance of 1776
Significance of 1776! of the month he or she was born. The predicted birthday is obtained by adding the entries in the second row, fourth column of the selected tables.

  • Take any non zero single digit, say 5

  • Create a three digit number by repeating this number, 555

  • If President Obama is our 44th president, what is the ranking of President Lincoln, 16

  • Multiply 555 by 16 = 8880

  • Divide this result by your original number, 8880/5 = 1776!

  • Repeat this for any non zero single digit and stay with 16 as the divisor, end result is 1776, always!!


Predict birthday and age
Predict birthday and age!! of the month he or she was born. The predicted birthday is obtained by adding the entries in the second row, fourth column of the selected tables.

  • Birth month times 5, Suppose October, the 10X5 = 50

  • Add 6, 50+6 = 56

  • Times 4, 56X4 = 224

  • Add 9, 224+9 = 233

  • Times 5, 233X5 = 1165

  • Add the day of the month, say October 31, 1165+31 = 1196

  • Simply subtract 165, 1196-165 = 1031!!


Magic squares for 2013
Magic Squares for 2013 of the month he or she was born. The predicted birthday is obtained by adding the entries in the second row, fourth column of the selected tables.


All these magic squares have the property sum of all the rows columns and the diagonals is 2013
All these magic squares have the property, sum of all the rows, columns and the diagonals is 2013!


Pick any 11 non overlapping numbers and the sum is 2013
Pick any 11 non overlapping numbers and the sum is 2013! rows, columns and the diagonals is 2013!


Card trick
Card Trick rows, columns and the diagonals is 2013!

Card A 2-10 J Q K

Code 1 2-10 11 12 13

Suit Club Diamond Heart Spade

Code 6 7 8 9

In five steps given below, you can easily predict the unknown card! Let’s roll!!

Suppose your participant has an Ace of Spades, which you are not aware.


Step 1. Card Number Ace = 1 rows, columns and the diagonals is 2013!

Step 2. Times 2 1X2 = 2

Step 3. Add 1 2+1 = 3

Step 4. Times 5 3X5 = 15

Step 5. Add the suit 15+9 = 24

Prediction: Simply subtract 5 from above!

24 – 5 = 19, last digit = Suit and the remaining digits indicate the card, Ace of Spades!!!


Three dice trick
Three Dice Trick!!! rows, columns and the diagonals is 2013!

In this number game, you can predict the three dice your opponent has rolled, which you are not aware.

Perform the following six steps and surprise your opponent:

Suppose the dice are 1, 3 and 6 in this order!


Step 1. First die times 2 1X2 = 2 rows, columns and the diagonals is 2013!

Step 2. Add 5 2+5 = 7

Step 3. Times 5 7X5 = 35

Step 4. Add the second die 35+3 = 38

Step 5. Times 10 38X10 = 380

Step 6. Add the third die 380+6= 386

Prediction: Simply subtract 250 = 386-250 = 136!

This trick could be extended to any three digit number 000-999!! Try!!!



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