The difference between 99 and 40 is: 
The difference between 88 and 45 is: 
The difference between 99 and 40 is: 
The difference between 99 and 40 is: 
The difference between 59 and 40 is: 
The difference between 99 and 30 is: 
The difference between 101 and 42 is: 
The difference between 99 and 40 is: 