Free Powerpoint Templates Page 1 Free Powerpoint Templates Random Interesting Math Tricks (more importantly, how do they work) HWW Math Club 11/28/2011.

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Presentation transcript:

Free Powerpoint Templates Page 1 Free Powerpoint Templates Random Interesting Math Tricks (more importantly, how do they work) HWW Math Club 11/28/2011

Free Powerpoint Templates Page 2 Does a number divide 2, 5, 10? Devise a method to determine if some number, for instance , is divisible by 2, 5, and 10 respectively. Just look at the last digit!

Free Powerpoint Templates Page 3 Does a number divide 3, 9? Devise a method to determine if some number, for instance , is divisible by 3 and 9 respectively. Add up the digits. It’s divisible if the sum of digits is divisible.

Free Powerpoint Templates Page 4 Does a number divide 6, 15, 18, 45? Devise a method to determine if some number, for instance , is divisible by these numbers. Combine the divisibility tests. If it’s divisible by 2 and by 3, it’s divisible by 6.

Free Powerpoint Templates Page 5 Does a number divide 11? Devise a method to determine if some number, for instance , is divisible by 11. Sum up alternating digits: = 0.

Free Powerpoint Templates Page 6 Does a number divide 7 or 13? Devise a method to determine if some number, for instance , is divisible by 7 or 13. Sum up alternating triple digits: 786 – = 133 which is divisible by 7 but not 13.

Free Powerpoint Templates Page 7 Last one is slightly different