3000 + 9000 =

(a)  

25000 + 17000 =

(a)  

7600 - 3300 =

(a)  

50000 - 22000 =

(a)  

 $3\cdot1500\ =$  

(a)  

 $1000\ \cdot\ 263\ =$  

(a)  

24000 : 8 =

(a)  

7200 : 800 =

(a)  

274000 : 1000 =

(a)