tomodan
Nov 3rd, 2006, 04:20 AM
Hi, new to the forums and I am trying to resolve a dispute that has arrisen at work. Can anyone point me to the mathmatical proof for the following:
If you:
Take any two digit number (eg 38)
sum the two digits from this number (3+8 = 11)
Subtract the result from the origional number (38-11 = 27)
The answer will always be a multiple of 9.
Can someone show me why this is always the case?
Much appreciated.
If you:
Take any two digit number (eg 38)
sum the two digits from this number (3+8 = 11)
Subtract the result from the origional number (38-11 = 27)
The answer will always be a multiple of 9.
Can someone show me why this is always the case?
Much appreciated.