Webmath
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Thread: Webmath

  1. #1
    Junior Member
    Join Date
    Nov 2002
    Posts
    20

    Webmath

    yea i noticed in one of the old posts that someone was lookin for help with math problems, the post was closed but i wanted to help out because i know how frustrating working math can be here's a good link that will work math problems as well as teach you how to solve the problem step by step... http://school.discovery.com/homeworkhelp/webmath/
    Webmath offers math homework help and math word problems at DiscoverySchool.com.

  2. #2
    Math tricks:
    1)i) Select a number (Z) from 1 to 9
    ii) Then Z x 9 = Y
    iii) Then Y x 12345679 = ZZZZZZZZZZ

    Find why every number will result to this.

    2)i) Select a two-digits number (ZY)
    ii) Then ZY x 101 = ZYZY

    Find why every numbers will result to this.


    Both of this, i learnt them from school.

  3. #3
    Senior Member
    Join Date
    Nov 2002
    Posts
    186

    Answers

    WARNING: IF YOU DON'T WANT TO KNOW THE ANSWERS STOP READING

    For question 1:
    Take the case Z = i

    y = 9i
    9i *123456789 = ZZZZZZZZZZ
    9 * 123456789 * i = ZZZZZZZZZZ
    1111111111 * i = ZZZZZZZZZZ
    iiiiiiiii = ZZZZZZZZZZ
    resusbstitute i = Z
    ZZZZZZZZZZ = ZZZZZZZZZZ

    Question 2:
    A bit harder to show
    If you use long multiplication from high school you will get
    101
    * XY
    -----
    Y0Y
    X0X0
    ------
    XYXY

    Each row will therefore be made of 0 Y 0 Y yada yada yada
    Since the next row is always shifted left one place it will be X 0 X 0
    This will ALWAYS produce X Y X Y.
    This can even be extended to 10101 * XY = XYXYXY

    Hopefully I didn't spoil anyone's fun by posting these answers (and hopefully they are correct as well!!)

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