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Mathemagic!!. Cheryl Miner Nebraska Wesleyan University [email protected] Binary Magic. Pick a number 1 – 64 Which number cards does your number appear? . Think of a Number. Think of a whole number Multiply by 2 Add 6 Add the square of your original number Subtract 5

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Mathemagic l.jpg

Mathemagic!!

Cheryl Miner

Nebraska Wesleyan University

[email protected]


Binary magic l.jpg
Binary Magic

  • Pick a number 1 – 64

  • Which number cards does your number appear?


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Think of a Number

  • Think of a whole number

  • Multiply by 2

  • Add 6

  • Add the square of your original number

  • Subtract 5

  • Take the square root of your answer

  • Tell me the answer

  • Your original number is: _______


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Divining Two Numbers

  • Volunteer rolls a pair of dice

  • Multiply the number on top of one die by 2

  • Add 3 to this.

  • Multiply by 5

  • To this result, add the number on top of the 2nd die

  • Multiply this sum by 10

  • Tell me the result & I’ll tell you the two numbers rolled!


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  • Select a number

  • Double it

  • Add 6

  • Divide by 2

  • Subtract your original number

    Your number is 3

    Any algebraic identity may be used as the basis of a number game.

    Create your own trick for the equation:


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Who’s Hiding the Coin

  • 2-9 volunteers & assign number to each person

  • Turn your back & have someone in group hide a coin in his/her left or right hand

  • Have someone

    • Multiply the number of person concealing coin by 2

    • Add 5

    • Multiply by 5

    • Add 10

    • Add 1 if the coin is in the right hand or

      Add 2 if the coin is in the left hand

    • Announce the result

  • Identify the person holding the coin and in which hand!


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Who’s Hiding the Coin

  • 2-9 volunteers & assign number to each person

  • Turn your back & have someone in group hide a coin in his/her left or right hand

  • Have someone

    • Multiply the number of person concealing coin by 2

    • Add 5

    • Multiply by 5

    • Add 10

    • Add 1 if the coin is in the right hand or

      Add 2 if the coin is in the left hand

    • Multiply by 10

    • Add 1 for penny, 2 for nickel, 3 for dime, 4 quarter, 5 for half dollar, 6 for dollar

    • Announce the result

  • Identify the person holding the coin and in which hand!



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The Missing 8

  • Write down 12345679

  • Volunteer: Place an “x” over the digit that you like the least

  • Multiply 12345679 by a number

    Answer: product will have all digits which match the number marked with the “x”


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Gopher Magic

http://www.learnenglish.org.uk/games/magic-gopher-central.swf


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Missing Digit

  • Pick a 5-digit number & multiply by 9

  • Write down the resulting number

  • Choose any digit (except zero) and circle it.

  • Find the sum of the remaining digits.

  • Tell me the sum.

  • Your missing digit is: _________


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The Magic of 8

  • Multiply your phone number (without its area code) by the number 8

  • Write down:

    • The product from step 1

    • Your 7-digit phone number

    • 8

  • Add all the digits in 3 numbers

  • If the sum is more than 1 digit, then add the digits in the sum. Continue adding up digits until only one digit is left.


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49 - Lucky Number Cubes

  • Find the following products:

    Top of Red * Top of White

    Bottom of Red * Bottom of White

    Top of Red * Bottom of White

    Bottom of Red & Top of White

  • Add the results


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