Magic Number 9 Posted on March 13, 2014 by cpjamesg Choose a three digit number e.g. 853. Then subtract the same digits but in a different order e.g. 538. This equals 315. Then add the numbers up. The number will always equal 9. This will work with any number with 2 digits or more. My Di told me this.
This amazed me when you told me this. Love things like this.