Be more specific I’m not understanding your question? 
 
        
             
        
        
        
Answer:
a squared plus b squared = c squared
Step-by-step explanation:
a) 100
b) 153
Honestly I'm just guessing i'm only in algebra 1 and even if i wasn't I suck at geometry 
 
        
                    
             
        
        
        
Because greater means best, and you have to start with the best!
Just kidding, the real answer is that it makes it more simple to count up on the number line. If you start with the higher number, you don't have to count up as many places because you count up whatever the value of the smaller number is