Now, for the "trick" with the Fibonacci number sequence.
Ask your friend for two numbers.
You could then enter the numbers in this computer page but it is much more impressive if this trick is done on paper.
Adding the two numbers, create a Fibonacci sequence that is exactly ten steps long.
When you reach the tenth number, tell your friend you can total all ten numbers in your head!
And what's the secret?
Whenever you have a Fibonacci sequence of 10 numbers, the total will always be the seventh number times 11.
For practice, input two and three in the first two boxes and then click "CALCULATE".
Yes, you could get the total by clicking "Calc Total" or by using the trick.
If you entered two and three for the first two numbers, the seventh number will be 34 and multiplying this by 11 gives a result of 374.
It isn't that difficult to multiply by 11 in your head.
For example, to multiply 34 by 11, think of summing 34 and 34 but shift one number one decimal place.
Obviously, when you ask a friend for two numbers make sure you mention they should be kept relatively small.
Doing this trick on paper is much more impressive than on a computer so why not use this computer page just for practice?
Remember, before you show this to anybody, the best advice is to practice.