Sunday, March 24, 2013

Formula that always equals 5

Friday a student, Miss P, showed our 2nd period class how to take a number and always get 5 as the answer.  By 5th period, we were testing it with any number we could think of.

Here is the formula: number + (number +1) +9 divided by 2 - original number.


STEPS:
Choose a number.
Add number you chose to the next number when counting.
Add 9 to that sum.
Divide that sum by 2.
Subtract the original number from that quotient.
You should have a difference of 5!!!!

Example: 8+9=17+9=26/2=13-8=5

I challenge you to tell me why this always equals 5.  (Hint.. look at just the numbers in the formula)

Enjoy!

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