Rules of 11

One of the patterns of the 11's times tables is that the number that for the single digit multiplcation of 11, (the numbers 1-9) the product will always be the number twice
            For example: 4 X 11 = 44    
1x 11 = 11
2x11 = 22
3x11 = 33
4x11 = 44
5x11 = 55
6x11 = 66
7x11 = 77
8x11 = 88
9x11 = 99
10x11 = 110
11x11 = 121
12x11 = 132


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