$401+68=$  

(a)  

 $326+148=$  

(a)  

 $160+275=$  

(a)  

 $244+63=$  

(a)  

 $375-75=$  

(a)  

 $351-143=$  

(a)  

 $418-255=$  

(a)  

 $575-189=$  

(a)  

364-78

(a)