Hi,
I'm not sure if you want to find the DIFFERENCE between 645 & 738 or 738 & 645. So Below I have done both of them below:-
645 - 738 = -93
If someone gave you 645 candies, and then someone else said you better give me 738 candies. So, in the end you would have -93 candies left.
738 - 645 = 93
If someone gave you 738 candies, and then someone else said you better give me 645 candies. So, in the end you would have 93 candies left.
Hope I helped:P