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Math Tricks and Divisibility Tests: An Interactive Guide

Learn fascinating tricks to determine divisibility by 2, 3, 5, and more. Understand the logic behind these math hacks in simple ways. Perfect for math enthusiasts in the HWW Math Club!

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Math Tricks and Divisibility Tests: An Interactive Guide

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  1. RandomInteresting Math Tricks (more importantly, how do theywork) HWW Math Club 11/28/2011 Free Powerpoint Templates

  2. Does a numberdivide 2, 5, 10? Devise a method to determine if somenumber, for instance 185924, is divisible by 2, 5, and 10 respectively. Just look at the last digit!

  3. Does a numberdivide 3, 9? Devise a method to determine if somenumber, for instance 185924, is divisible by 3 and 9 respectively. Add up the digits. It’s divisible if the sum of digits is divisible.

  4. Does a numberdivide 6, 15, 18, 45? Devise a method to determine if somenumber, for instance 185924, is divisible by thesenumbers. Combine the divisibility tests. If it’s divisible by 2 and by 3, it’s divisible by 6.

  5. Does a numberdivide 11? Devise a method to determine if somenumber, for instance 1362075, is divisible by 11. Sum up alternating digits: 5-7+0-2+6-3+1 = 0.

  6. Does a numberdivide 7 or 13? Devise a method to determine if somenumber, for instance 10663786, is divisible by 7 or 13. Sum up alternating triple digits: 786 – 663 + 10 = 133 whichis divisible by 7 but not 13.

  7. Last one isslightlydifferent If I have some money in the bankwith compound interest of a year (compoundedfrequently), how long doesittake for my money to double? Divideitfrom 72. If it’s 3%, ittakes about 72/3 = 24 years to double.

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