8 + 7 = (a)  

• 14 + 16 = (a)  

• 28 - 8 = (a)  

• 2 x 4 = (a)  

• 2 x 7 = (a)  

• 5 x 7 = (a)  

• 2 x 9 = (a)  

• 5 x 9 = (a)  

• 2 x 6 = (a)