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IGNITE – Fun with Math J. Sriskandarajah AMATYC Conference Anaheim, October 31, 2013 jsriskandara@madisoncollege.edu

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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!!

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Predicting birthday! Mind Reading/Mind Boggling!! 927515 2519131 3111217 1732923 327631 2619142 1023227 18113015

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729631 285144 12212215 20133023 25311029 2427148 28151326 1211309

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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. 18292723 24252216 28212631 20173019

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Become a psychic! 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!

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Significance of 1776! Take any non zero single digit, say 5 Create a three digit number by repeating this number, 555 If President Obama is our 44 th 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!!

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Predict birthday and age!! 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!!

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Magic Squares for 2013 674667672 669671673 670675668 323349320351352318 324328344345325347 336331333332340341 335337339338334330 342346327326343329 353322350321319348

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All these magic squares have the property, sum of all the rows, columns and the diagonals is 2013! 178239168229158219148209138199128 129179240169230159220149210139189 190130180241170231160221150200140 141191131181242171232161211151201 202142192132182243172222162212152 153203143193133183233173223163213 214154204144194123184234174224164 165215155205134195124185235175225 226166216145206135196125186236176 177227156217146207136197126187237 238167228157218147208137198127188

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Pick any 11 non overlapping numbers and the sum is 2013! 219215221217211220212213214216218 175171177173167176168169170172174 241237243239233242234235236238240 197193199195189198190191192194196 131127133129123132124125126128130 230226232228222231223224225227229 142138144140134143135136137139141 153149155151145154146147148150152 164160166162156165157158159161163 186182188184178187179180181183185 208204210206200209201202203205207

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Card Trick CardA2-10JQK Code12-10111213 SuitClubDiamondHeartSpade Code6789 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.

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Step 1.Card NumberAce=1 Step 2.Times 21X2=2 Step 3.Add 12+1=3 Step 4.Times 53X5=15 Step 5.Add the suit15+9=24 Prediction:Simply subtract 5 from above! 24 – 5 = 19, last digit = Suit and the remaining digits indicate the card, Ace of Spades!!!

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Three Dice Trick!!! 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!

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Step 1.First die times 21X2=2 Step 2.Add 52+5=7 Step 3.Times 57X5=35 Step 4.Add the second die35+3=38 Step 5.Times 1038X10=380 Step 6.Add the third die380+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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One for the road…smallest magic square with a magic sum of 2014! 503506509496 508497502507 498511504501 505500499510

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