# 1
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Grab a calculator. (you won't be able to do this one in your Head) 1. Key in the first three digits of your phone number (NOT the Area code) 2. Multiply by 80 3. Add 1 4. Multiply by 250 5. Add the last 4 digits of your phone number 6. Add the last 4 digits of your phone number again. 7. Subtract 250 8. Divide number by 2 Do you recognize the answer ??
__________________ "Duncan exhibited at least three facial expressions, a career high." |

# 3
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Sorry jeenyus.
__________________ "Duncan exhibited at least three facial expressions, a career high." |

# 5
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Quote:
(((80*abc + 1)*250)+2*defg-250)/2 = (80*250*abc + 250 +2*defg-250)/2 = (20000*abc +2*defg)/2 = 10000*abc + defg = abc * 10^4 + defg = abc0000 + defg = abcdefg = your phone number There's nothing interesting about this. A gradeschooler could invent the steps to get this result, as it's all based on (80 *250)/2 = 10000. |

# 6
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Quote:
__________________ "Duncan exhibited at least three facial expressions, a career high." |

# 9
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Yes. That's a classic from waaay back in the day.
__________________ "Duncan exhibited at least three facial expressions, a career high." |

# 10
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If you take a convolution integral, you can LaPlace transform the arguments, add them together, and inverse LaPlace transform them, and the result is the product of the convolution arguments. Now that's a sweet math trick. $
__________________ When the Spurs lose...it makes Baby Jesus cry |

# 12
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Pointing out to mav fans that 3 > 0 is another math trick I find quite entertaining. Yep. Give any puberty stricken teenage boy a calculator and he'll have derived that magic numerical sequence in a matter of minutes. |

# 13
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But I did it in my head Good for her! Men truly are from Mars.
__________________ Badgerland's #1 Spurs fan. Still crazy after all these years. |

# 14
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Maybe you should have them type in 7734206 instead. |

# 15
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I don't know if that's a trick so much as the purpose of the Laplace Transform.
__________________ JAVIE SUCKS! JAVIE SUCKS! -- |

# 16
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Did you know that 142.857 is a curious number? 142.857 x 2 = 285.714 ( same digits ) 142.857 x 3 = 428.571 idem 142.857 x 4 = 571.428 idem 142.857 x 5 = 714.285 idem 142.857 x 6 = 857.142 idem 142.857 x 7 = 999.999 !!! 142.857 x 8 = 1.142.856 (number missing is 7, but last -6- and first -1- add to 7 142.857 x 9 = 1.285.713 (number missing is 4, but last and first add to 4 ) You can go on and on... |

# 17
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Quote:
This one is the key to all that. Multiples of 9 produce a lot of odd number things. Remember the way the whole 9 times table added up to 9? 9 x 1 = 09 ; 9 + 0 = 9 9 x 2 = 18 ; 1 + 8 = 9 9 x 3 = 27 ; 2 + 7 = 9 9 x 4 = 36 ; 3 + 6 = 9 9 x 5 = 45 ; 4 + 5 = 9 9 x 6 = 54 ; 5 + 4 = 9 9 x 7 = 63 ; 6 + 3 = 9 9 x 8 = 72 ; 7 + 2 = 9 9 x 9 = 81 ; 8 + 1 = 9 9 x 10 = 90 ; 9 + 0 = 9 |

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