Make up a four or five digit number ex. 12345
Add the total of the digits ex. 12345 = 15
subtract the total from the original sum ex. 12345 - 15 = 12330
Circle any one of the numbers ex 12(3)30
Give me ONLY the numbers you did not circle and I will tell you which number you circled.
The number you circled is 0 or 9!
Gidday Randy I am ready with mine for you to give it a bash.
Hullo BP! Your answer would be 4! No kiddin'!
Fair dinkum you are right Randy. I am buggered to how you did that?
4 it is. Woo hoo!!!!!!!!
You are the man.
This really is magic! How are you doing this??
I reckon he has magic powers lurking somewhere in there. I wonder if I pop him in a bottle he can be my magic genie.
No magic, just math! I will tell you how it works tomorrow in case someone else wishes to try it! I've won a few beers in my lifetime doing this trick!
I don't want to hurt my head figuring this out what's the trick behind it?
Okay, here is the answer to how this trick works.
This trick is based on the number 9. For example : if you give me the numbers 123, I would add them up and get 6. I subtract 6 from 9 and get 3. The number you circled would be 3.
If the numbers totaled over 9, say 12, them you would subtract the total from 18 and get 6. And so on with multiples of 9 such as 27, 36, etc.
The only time there is not a certain answer is when the given numbers total 9, 18, 27, etc. Then the answer is either 0 or 9.
There are other tricks using nine as a basis. It's an interesting numeral! Enjoy the magic!
Indeed you did, Wilderness! Thanks for not spoiling it!
Aw, that would've ruined all the fun!
Have you ever tried to figure out just WHY it works that way?
Yes, I actually discovered the trick in an encyclopedia years ago and it was explained fully, but I haven't thought about why it works for a long time. There are some other neat tricks using the number nine but this is my favorite.
As I said earlier, it has earned me a few beers on occasion!
by Liz Elias 3 years ago
Okay, there is a trick to this one; you must think outside the box. (Remember, I'm not a mathematician, and I suck at math...so this is more of a creative thinking than a math quiz.)What is the sum of the 1st G, squared?
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