Digit Reversal Differences Explained

Let's take two-digit reversal pair like 72, reverse its digits to get 27,

and subtract the smaller from the larger. 72 to 27 is equal to 45.

Now, take the digit seven and two, find their difference, seven to two is

equal to five, and multiply by nine. Five times nine equals 45.

It's the same result. Try it yourself. 81 and 18 difference is 63. Digits eight to

one is equal to seven. Seven times nine equals 63. 63 and 36 difference,

27. Digits six to three is equal to three. Three times nine equals 27.

It works every time. Why? Because any two-digit number can be written as 10A plus B,