 ... Number Tricks ...
... Recommend this page to a friend. Note: This riddle must be done in your head and not using paper and a pen. ... Do people still use pencils?
Take 1000 and add 40 to it, and then add another 1000.
Now add 30 and then add another 1000.
Now add 20 and again add another 1000.
Now add 10, and what is the total?
Remember it now.
Click for Answer |
Did you get 5000? The correct answer is actually 4100.
Try it again; won't take long ... and if you don't believe it,
Check with your calculator. |
THE FOLLOWING is certainly not a number trick but I thought is was cute. There are probably thousands of pages on the www devoted to number tricks and riddles of all sorts. Often they are sent to me by readers from all over: north, east, west, south (did you know that "news" is a word indicating all four directions?)
QUESTION: What occurs once in a second, once in a minute, twice in a millennium, but never in a lifetime? ... Give it some thought.
The letter N ... how can you not know; it's obvious.
Seriously, using some advanced statistical analysis with a bit of calculus thrown in, I'd say that 10 out of 9 people wouldn't know the answer ... possibly more.
And finally, there's what we call "undecimal counting" (that's counting by 11; "undecimal" comes from the Latin "undecim" meaning 11). Weird things happen with 11. For example, in multiplying by eleven ... 111,111,111 x 111,111,111 equals 12,345,678,987,654,321. Ever wonder about those people who spend their time figuring out these trivia?
An interesting extension of this undecimal counting is seen in the ISBN number (International Book Numbering System) of published books. Any ISBN comprises ten digits. Now here's the thing; if you multiply the first digit (on the left) by ten, the second by nine, the third by eight, and so on, summing the results as you go along, the result will always be divisible by eleven. This is one way of checking to see if an ISBN is legitimate; it doesn't work with any 10 digits taken at random.
Enough, now we return to our ... Navigator ... it's the heart of this website.
|