Binary arithmetic tutorial
In decimal (base 10), the number 403 means 4*10^2 + 0*10^1 + 3*10^0, or 4*100 + 0*10 + 3*1, or 400 + 0 + 3
Similarly, in binary (base 2), the number 1011 means 1*2^3 + 0*2^2 + 1*2^1 + 1*2^0, or 1*8 + 0*4 + 1*2 + 1*1, or 8 + 0 + 2 + 1, which is the same as the decimal number 11