It depends. Assuming that you mean 12 by 12 in. blocks, then you would need 105 of them, because 12 inches is one foot, and 1x1=1. 105 divided by 1 is 105.
0.2188
105 can be divided by 1, 3, 5, 7, 15, 21, 35, 105.
12% of 105 = 12% * 105 = 0.12 * 105 = 12.6
105
105
105
105
105
105
105 / 3 = 35
105