Cool Math Trick

Discussion in 'Miscellaneous' started by JParsonsX, Apr 10, 2015.

?

Is this cool?

Poll closed Apr 12, 2015.
Yes! 5 vote(s) 29.4%
Nah 4 vote(s) 23.5%
I knew about it 8 vote(s) 47.1%
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  1. So, I found this cool math trick on Instagram (=P) and I thought I would share it with you guys. :D

    1. Take a number

    2. Double it

    3. Add six

    4. Half it

    5. Subtract from the number you started with

    6. Your answer is three

    Example:
    1. 6
    2. 6 + 6 = 12
    3. 12 + 6 = 18
    4. Half of 18 is 9
    5. 9 - 6 = 3
    6. Answer is 3

    Try it ;)
    (also, I requested my white stained clay thread to be closed in case I am not allowed to have more than one thread at the same time)
    JParsonsX, Apr 10, 2015
    #1
    Byeforeverthe2nd, Todd_Vinton and ShelLuser like this.
  2. If you leave out Step 3, your number doubled, then halved, then subtracted from itself leaves zero. When you add six in Step 3 then halve the result, you have added three, which explains why the result is always three.
    Pab10S, Apr 10, 2015
    #2
    607 likes this.
  3. You're allowed to have as many threads as you want, but can only have one auction going at a time.
    Rhyblet, Apr 10, 2015
    #3
    tuqueque and PenguinDJ like this.
  4. Thanks! I won't be doing auctions very much bye :p
    JParsonsX, Apr 10, 2015
    #4
  5. bump....
    JParsonsX, Apr 10, 2015
    #5
  6. Urm... it returns the original number in half. Did it with 2009:
    2009 * 2 = 4018
    4018 + 2009 = 6027
    6027 / 2 = 3013.5
    3013.5 - 2009 = 1004.5
    --
    2009 / 2 = 1004.5
    nfell2009, Apr 10, 2015
    #6
  7. 1. Take a number-2009

    2. Double it-4018

    3. Add six-4024

    4. Half it-2012

    5. Subtract from the number you started with 2012-2009

    You are basically subtracting your original number from itself and adding 3, which results as 3 every time

    6. Your answer is 3
    TechNinja_42, Apr 10, 2015
    #7
    Rainbowpony1000 and nfell2009 like this.
  8. x * 2 = 2x
    2x + 6
    2x + 6/2 = x + 3
    x + 3 - x = 3
    ItsMeMatheus, Apr 10, 2015
    #8
    Deadmaster98, 607, hashhog3000 and 2 others like this.
  9. I'll tell you a math trick I made up a long time ago:

    Take the square of a number

    we'll use 4 ...which is 16

    Take the square of the next number in sequence

    which would be 5 - so 25

    take the difference of the two squares

    25-16 = 9

    add 2

    9+2 = 11

    add that to the last highest square, which is 25

    25 + 11 = 36

    36 square rooted is 6 (the next number in the sequence)

    ------

    36-25 = 11

    11+2 = 13

    36 + 13 = 49

    square root of 49 is 7 ...see the pattern? ;)
    Elite, Apr 10, 2015
    #9
    Petero555 and 607 like this.
  10. My bad! I was reading from the OP and how he did it. Turns out he used six as his example >.<
    nfell2009, Apr 10, 2015
    #10
  11. I guess that's why they call you.... Matheus
    72Volt, Apr 10, 2015
    #11
    607, Rainbowpony1000 and hashhog3000 like this.
  12. Are you calling me a boy? :eek:
    JParsonsX, Apr 10, 2015
    #12
    607 likes this.
  13. you saw nothing *waves hands around*
    nfell2009, Apr 10, 2015
    #13
    607 likes this.
  14. XD
    JParsonsX, Apr 10, 2015
    #14
  15. Pretty cool.
    Nighthawk3846ALT, Apr 10, 2015
    #15
  16. Hey, I can do fancy math, too!
    Hashhog, Apr 10, 2015
    #16
    Petero555, Dwiss, ShelLuser and 2 others like this.
  17. oneplus.fw.png
    nfell2009, Apr 10, 2015
    #17
    Rainbowpony1000 and FDNY21 like this.
  18. Therefore, we know that window = 3. Nice work, EMC. We've done good math today.
    Hashhog, Apr 10, 2015
    #18
    Deadmaster98 and FDNY21 like this.
  19. *laughs* :p
    JParsonsX, Apr 10, 2015
    #19
  20. this is why:

    the red is basically add three

    the green is x-x+3=3
    Tuqueque, Apr 10, 2015
    #20
    ShelLuser likes this.
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