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1010(2) = 1 * 2^3 + 0 * 2^2 + 1 * 2^1 + 0 * 2^0 = 8 + 0 + 2 + 0 = 10(10)
0011(2) = 0 * 2^3 + 0 * 2^2 + 1 * 2^1 + 1 * 2^0 = 0 + 0 + 2 + 1 = 3(10)
1111(2) = 1 * 2^3 + 1 * 2^2 + 1 * 2^1 + 1 * 2^0 = 8 + 4 + 2 + 1 = 15(10)