790 + 40 =

(a)  

610 - 40 =

(a)  

350 - 80 =

(a)  

350 - 53 =

(a)  

210 - 24 =

(a)  

290 + 24 =

(a)  

190 + 21 =

(a)  

750 + 61 =

(a)  

840 + 61 =

(a)  

150 + 84 =

(a)  

110 - 80 =

(a)  

860 - 80 =

(a)  

810 - 33 =

(a)  

450 + 83 =

(a)