Neat Math Trick – IOTW Report

Neat Math Trick

Wednesday, 13 February 2019, 13:15 BFH Uncategorized 24

Bubba says:
For as long as I can remember, I have loved math tricks. This one really works! It will take you only about ten seconds and, amazingly, it will reveal your all-time favorite movie.

I’m pretty good at math, so I did it in my head, then on paper, and finally
on a calculator, just to confirm my mathematical calculations. Each time I got the same answer, and sure enough, it IS my very favorite movie…EVER!

DO NOT cheat. DO YOUR math, THEN compare the results on the list of movies at the bottom.  You will be AMAZED at how scary true and accurate this test is:

  

1. Pick a number from 1-9.
2. Multiply that number by 3.
3. Add 3.
4. Multiply by 3 again.
5. Your total will be a two digit number. Add the first and second digits together to find your favorite movie (of all time) in the list of 17 movies below:

  

Movie List:
1. Gone With the Wind
2. E.T.
3. Blazing Saddles
4. Star Wars
5. Forrest Gump
6. The Good, the Bad, and the Ugly
7. Jaws
8. Grease
9. The Nancy Pelosi Resignation
10. Casablanca
11. Jurassic Park
12. Shrek
13. Pirates of the Caribbean
14. Titanic
15. Raiders of the Lost Ark
16. Home Alone
17. Mrs. Doubtfire

  

… Now, isn’t that something

24 Comments on Neat Math Trick

  8. ohoh! That’s my favorite too. Every old person is scared of how awesome I am. We can cut our 12 year goal (That’s 41% of a lifetime folks!) to 6 years if we just get rid of all the old people.

    6

  21. Here is a “real” numerology trick with the number nine…

    “What I want to know is why, no matter what number you use, if you [add its digits together, subtract this from the original number, and then repeatedly sum the digits of the resulting numbers], the answer is always 9? Take the number 3,568 for example:=

    Add those digits together: 3 + 5 + 6 + 8 = 22
    Subtract 22 from your original number: 3,568 – 22 = 3,546
    Add those digits together: 3 + 5 + 4 + 6 = 18
    Add those digits together: 1 + 8 = 9
    I come up with 9 no matter what I do. I just want to know WHY!?!”

    2

  23. “First Steps” THEOREM: A positive integer N minus sum of its digits in decimal notation is divisible by 9.
    PROOF:
    N = 10^k*d_k + 10^(k-1)*d_(k-1) + … + 10*d_1+ d_0
    -( d_k + d_(k-1) + … + d_1 +d_0)
    ————————————————-
    (10^k-1)*d_k + (10^(k-1)-1)*d_(k-1) + … + 9*d_1
    Each term of sum above is divisible by 9 so N is divisible by 9 QED

    “Repeatedly Sum” THEOREM: If a positive number N is divisible by 9 then the sum of its digits in decimal notation is divisible by 9
    PROOF:
    N = 10^k*d_k + 10^(k-1)*d_(k-1) + … + 10*d_1 + d_0
    = [ (10^k-1)*d_k + (10^(k-1)-1)*d_(k-1) + … + 9*d_1] +
    d_k + d_(k-1) + … + d_1 + d_0

    Since each of the terms in [ ] is divisible by 9 so also must d_k + d_(k-1) + … + d_1 + d_0 since N is divisible by 9 QED
    See Wiki article on “Casting Out Nines”

  24. Here’s my all time favorite in this genre: A guy asked a mathematician about how to sex his cat. The mathematician asked, “What name if male?” He replied, “Sable.” “What name if female?” He replied, “Sally.” So the mathematician wrote down the table:
    0123456789
    SABLESALLY
    Next the mathematician gave the guy a set of instructions:
    (1) Write down a 3 digit number whose first and last digit are different (call it X)
    (2) Reverse the digits of X and subtract the smaller from the larger (call result Y)
    (3) Reverse the digits of Y and add to Y (call the result Z)
    (4) Multiply Z by 20 (Call the result W)
    (5) Do table lookup on W to find letters corresponding to each digit.
    Example:
    321 (X)
    -123
    —-
    198 (Y)
    +891
    —-
    1089 (Z)
    *20
    —-
    21780
    Table Lookup: BALLS It’s a tomcat!

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