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When multiplying by 2's just think of the number number you are multiplying 2 by, added to it's self.
Example: 5 + 5 = 10  5 x 2 = 10 
Addition 
Multiplication 
Addition 
Multiplication 
4 + 4 = 
2 x 4 = 


6 + 6 =  2 x 6 = 


2 + 2 =  2 x 2 = 


7 + 7 =  2 x 7 = 


9 + 9 =  2 x 9 = 


8 + 8 =  2 x 8 = 


10 + 10 =  2 x 10 = 

