# By TengCH The Most Beautiful Mathematical Magic Games & Puzzles (01)

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Slide 2 By TengCH The Most Beautiful Mathematical Magic Games & Puzzles (01) Slide 3 16 of The Most Beautiful Mathematical Magic, Games & Puzzles (01) 1.The Flash Mind ReaderCrystal ball magic 2.Sum of 10 numbersFibonacci Magic 3.3-digit numbers, abcMagic Number 9 4.Five Tetrominoes $10K Puzzle5 x 4 rectangle 5.Magic Tables Binary Magic 6.Secret of Dies 7.Traffic Jam Leap frogs Best Team-building game 8.Tower of Hanoi Mathematical Recurrency 9.Sum to 20Game strategy 3 levels. 10.Bai Qian Mai Bai Ji Problem of the 100 Fowls 11.Han Xin Dian Bin ) Remainder Theorem 12.9 Flips 13.Consecutive Sum 14.The Singapore Polytechnic Lockers 15.Winners & the Chocolates 16.$5 & $2 notes 17.Who keep the Fish? ( ?) & More Slide 4 Think of a two digit number Add both digits together Subtract the total from your original. Look up on the chart for your final number. Find the relevant symbol. Click on the crystal ball. Slide 5 1 Get two participants as Volunteers Each of them suggests a number, any number between 1 to 20. The third number is the sum of the first two numbers, the forth number will be the sum of second & third number, so on and so forth, The subsequence number will be the sum of the previous two numbers, until you have all the 10 numbers Now, ask the volunteers to add up all the 10 numbers. ( Someone will be able to tell you the SUM well before they have completed the calculation. Why?) 2 Sum of 10 numbers Fibonacci Magic Slide 6 1 Think of any three digit number ABC Rearrange the same three digits in any order to form another number, eg. BAC Work out the difference of the 2 numbers. You get xyz or xy Remove one of the digit (except 0)from your answer, and show me the remaining digits. I will be able to tell the digit that you had removed. Why? How? Three different digits http://trunks.secondfoundation.org/files/psychic.swf 3 Magic Number 9 Cast out 9, Divisible by 9 Slide 7 1 The Five Tetrominoes 4. The Five Tetrominoes magic/puzzle Trace the five shapes shown in the Figure on a sheet of cardboard or stiff paper, and cut them out. Can you fit them together to make the 4 x 5 rectangle as shown in ? Pieces may be turned over and placed with either side up. Using the 5 different shapes of tetrominoes. Can you fit them together to form a 4 x 5 rectangle as shown? Pieces may be turned over and placed with either side up. You will be rewarded with $10K if you form it within one hour Slide 8 1357 9111315 17192123 25272931 Table A 2367 10111415 18192223 26273031 Table B 4567 12131415 20212223 28293031 Table C 891011 12131415 24252627 28293031 Table D 16171819 20212223 24252627 28293031 Table E 5. Magic Tables Slide 9 Slide 10 7. Traffic Jam - Fishing Boat Leap-Frog Ten Men are fishing from a boat, five in the front, five in the back, and there is one empty seat in the middle. The five in front are catching all the fish, so the five at the back want to change seats. To avoid capsizing the boat, they agree to do so using the following rules: 1.A man may move from his seat to and empty seat next to him. 2.A man may step over only one man to an empty seat. 3.No other move are allowed. What is the minimum number of moves necessary for the men to switch places? If there are n men from each side, how many moves is needed for the swap? Slide 11 1 8. Tower of Hanoi http://www.mathsnet.net/puzzles/hanoi/ Slide 12 1 8. The Tower of Hanoi The French mathematician Edward Lucas (1842- 1891) constructed a puzzle with three pegs and seven rings of different sizes that could slide onto the pegs. Starting with all the rings in one peg in order by size, the problem is to transfer the pile to another peg subject to two conditions: Rings are moved one by one, and no ring is ever placed on top of a smaller ring. Legend has it that an order of monks had a similar puzzle with 64 large golden disks. The monks supposedly believed that the world would crumble when the job was finished. How many moves are required? For n rings? http://www.mathsnet.net/puzzles/hanoi / Slide 13 Select all the cards with 1 to 5 You are now having a pool of cards with 4 sets of cards from 1 to 5, all cards are open, facing up. Play between 2 players (0r 2 teams of players) The players take turns to choose a card from the pool, and sum up the numbers of all the cards selected from both players Whoever gets the last card that the total sum reaches 20 win the game. Who will win? How? 9. Slide 14 A man paid exactly 100 dollars for 100 chicken A rooster cost $5 each, a hen cost $3 each, and a dollar for 3 chicks How many roosters, hens and chicks did the man buy? 10 Bai Qian Mai Bai Ji Slide 15 11 Han Xin Dian Bing 1/2 1. Han Xin, an Han dynasty general, devised a method to count the exact number of his soldiers. 2.He arranged them in rows of 5, 6, 7 and 11, from the remainders, he will be able to know the exact number of his soldiers. 3.How did he do that? 4.With the respective remainders of 1,5, 4,10, What is the exact number of s soldiers? Slide 16 Han Xin Dian Bing Solution Simplification Methods Two Remainder Theorems: 1.Number X multiply by M, remainder also multiply by M 2.Addition of Multiple of divisor, X + D x M, Remainder unchanged No Divisor D RemainderX Multiplication of remainder value N325x7=352135 N533x7=211363 N723x5=151230 Sum128 LCM3x5x7105 Final Answer N=23 Slide 17 Han Xin Dian Bing Solution Two Remainder Theorems: 1.Number X multiply by M, remainder also multiply by M 2.Addition of Multiple of divisor, X + D x M, Remainder unchanged Han Xin Dian Bing; the real question Number Divisorremainder X Multiplication of remainder Final value N 51 N 65 N 74 N 1110 Sum LCM N= Slide 18 abcdefghijkl X 9 lkjihgfedcba 12. 9 Flips What is the 12 digit number abcdefghijkl ? Suppose that N is a positive number written base 10, and that 9xN has the same digits as N but in a reversed order. Then we shall say for short that N is a 9-Flip Find all 9-flips with 12 digits Is it possible to say exactly how many 9-flips there are with precisely n digits? Slide 19 13. Consecutive Sums Some numbers can be expressed as the sum of a string of consecutive positive numbers, Exactly which numbers have this property? For example, observe that; 5=2+3 9=2+3+4 =4+5 11=5+6 18=3+4+5+6 =5+6+7 What are the consecutive numbers that sum to 30? 30= ? How about 105? 315? 2310 = ?? Slide 20 13. Consecutive Sums Some numbers can be expressed as the sum of a string of consecutive positive numbers, Exactly which numbers have this property? 1.What are the numbers have no consecutive sum? Old or even integers? average 2.Exactly How many solutions will it be? If there are more than one solution. 3.How to determine the number of solutions? The Methodology? 4.Fn= ? 5.1=, 2= 3=, 4=, 5=, 6=, 7=, 8=, 9=,10=, 6.The single solution problem. For example, observe that; 5=2+3 9=2+3+4 =4+5 11=5+6 18=3+4+5+6 =5+6+7 What are the consecutive numbers that sum to 30? 30= ? How about 105? 315? 2310 = ?? Slide 21 At Singapore Polytechnic, there were 1,000 students and 1,000 lockers (numbered 1-1000). At the beginning of our story, all the lockers were closed. The first student come by and opens every locker. Following the first students, the second student goes along and closes every second locker. The third student changes the state, ( if the locker is open, he closes it; if the locker is closed, he opens it) of every third locker. The fourth student changes the state of every fourth locker, and so forth. Finally, the thousandth student changes the state of the thousandth locker. When the last student changes the state of the last locker, Which lockers are open? 14. The Singapore Polytechnic Lockers Slide 22 1 15. Winners & the Chocolates ( 2/3) After a mathematics quiz, Mrs Lai YM gave the three prize winners a box of chocolate Bars to share. The first winner received 2/3 of the chocolate Bars plus 1/3 of a bar. The second winner received 2/3 of the remainder plus 1/3 of a bar, The Third winner received 2/3 of the New remainder plus 1/3 of a bar. And there will no chocolate Bars left after this. How many chocolate Bars were there in all? How about if there was One bar Left? How about if there were 5 winners? Slide 23 16. $5 & $ 2 notes The number of $5 notes to $2 notes is in the ratio 3 : 2. When $50 worth of $2 notes are converted to $5 notes, the new ration is 8 : 5. How many $5 notes are there? PSLE question Slide 24 Albert Einstein once posed a brain teaser that he predicted only 2% of the world population would get. FACTS 1. There are 5 houses in 5 different colours 2. In each house lives a man with a different nationality 3. These 5 owners drink a certain beverage, smoke a certain brand of cigarette and keep a certain pet 4. No owners have the same pet, brand of cigarette or drink 17 Who keep the Fish? ? Slide 25 CLUES 1. The Brit lives in a red house 2. The Swede keeps a dog 3. The Dane drinks tea 4. The green house is on the left of the white house 5. The green house owner drinks coffee 6. The person who smokes Pall Mall keep birds 7. The owner of the yellow house smokes Dunhill 8. The man living in the house right in the center drinks milk 17 Who keep the Fish? ? Slide 26 9. The Norwegian live in the first house 10. The man who smokes Blend lives next to the one who keeps cats 11. The man who keeps horses lives next to the man who smoke Dunhill 12. The owner who smokes Blue Master drinks beer 13. The German smokes Prince 14. The Norwegian lives next to the blue ouse 15. The man who smokes Blend has a neighbour who drinks water The question is, who keeps the fish? This is not a trick question- it is a genuine logic puzzle..... 17. Who keep the Fish? ? Slide 27 Rearrange the numbers, such that Sum of the 8 numbers in the larger circle Could be divisible by The product of the 3 numbers in the smaller circle How? What is your approach? 18. 1 -9 Magic Number Slide 28 During the Foon Yew Maths Society gat hering @ the auditor

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