26 + 25 + 24 + 23 + 20 = 64 + 32 + 16 + 8 + 1 = 121
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1001 in binary is equal to 9 in decimal.
When you write the decimal number '7' in Base-2 (binary), you write '0111'.
8
11111100 = 252
In binary this would be written as 1011. This is because in binary (from right to left) the digits in this number mean: (1 * 20) + (1 * 21) + (0 * 22) + (1 * 23). This, of course, is equal to (1 * 1) + (1 * 2) + (0 * 4) + (1 * 8), which equals 1 + 2 + 0 + 8, which equals 11 (in decimal).