The difference between 67 and 61 is: 
The difference between 74 and 64 is: 
The difference between 69 and 61 is: 
The difference between 67 and 63 is: 
The difference between 87 and 61 is: 
The difference between 67 and 51 is: 
The difference between 70 and 64 is: 
The difference between 67 and 61 is: 