Exactly two ways...
There are also 41 + 59 and 89 + 11 that add up to 100...
reply
97 + 71 = 79 + 89 = 168 ??
reply
What about 19+73? ;)
I'll go to sleep now, will be interested to read other trials in the morning.
EDIT: Seems like you edited the answer I was answering to.
reply