A Brain Teaser
Here is a trick I ran across and found interesting.
Think of a 3-digit number where the difference between the first and last digit is at least 2 (for example, 124 works, 122 does not).
Reverse the number and subtract the smaller from the larger.
Reverse this new number, and add it back to the result of Step obtained above.
70% of the time you will get 1089.
I Tried this 10 Times and Got 1089 Each Time
Give this a Try Yourself
As you can see from my numbers above, I tried this with ten different numbers and came up with 1089 as the result each time.
Try this yourself and let me know if you can find any numbers which are in the 30% that do not result in 1089.