42+18=

(a)  

73+28=

(a)  

9+9+9+9=

(a)  

86+24=

(a)  

250+120=

(a)  

8+8+8+8+8+8=

(a)  

400+250=

(a)  

6+6+6+6+6=

(a)  

90+34=

(a)