1+1=

Quiz yourself by guessing what should be in each of the black rectangles below before clicking on it to display the answer.
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problem
anwser
1+1=  2  
2+2=  4  
3+3=  6  
4+4=  8  
5+5=  10  
6+6=  12  
7+7=  14  
8+8=  16  
9+9=  18  
10+10=  20  
11+11=  22  
12+12=  24  
13+13=  26  
14+14=  28  
15+15=  30  
16+16=  32  
17+17=  34  
18+18=  36  
19+19=  38  
20+20=  40  


   

 
 

 
 

 

 
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