**SUBTRACTION**

>! [![enter image description here][1]][1]
>!    
>!         
>! A=7     
>! B=1   
>! C=4   
>! D=8   
>! E=5   
>! F=6   
>! G=2   
>! H=3  
>! A>C   
>! A>F     
>! A>H   
>! F>C    
>!    
>! **METHOD**
>!      
>! I tried to get the higher values inside the result box. I chose 7 out of 7 and 8. And then, got the following things working -      
>!    
>! 8-1 = 7     
>! 8-2 = 6(Next big number)      
>! 5-1 = 4(Next big number)     
>! 5-2 = 3(Final big number)     

**ADDITION**
>! [![enter image description here][2]][2]
>!    
>!         
>! A=8     
>! B=2   
>! C=5   
>! D=6   
>! E=3   
>! F=7   
>! G=1   
>! H=4  
>! A>C   
>! A>F     
>! A>H   
>! F>C    
>!    
>! **METHOD**     
>!    
>! For addition, I tried getting the bigger numbers in the result box.    
>!     
>! 6+2 = 8(Biggest)     
>! 6+1 = 7(Next biggest)    
>! 3+2 = 5(Next biggest)    
>! 3+1 = 4(Final)     


  [1]: https://i.sstatic.net/jFof9.png
  [2]: https://i.sstatic.net/mSYKf.png