In a binary number (assuming that is indeed expressed as binary. Note that 00111011 is also a perfectly valid decimal number) each column represents a multiple of a power of two. It works exactly the same way that decimal does, except that decimal uses powers of ten. As a result, where in decimal you have a ones column, a tens column, a hundreds column, and so on - with binary you instead have a ones column, a twos column, a fours column, etc.
The number you're asking to convert to decimal then, would be:
0 * 27 + 0 * 26 + 1 * 25 + 1 * 24 + 1 * 23 + 0 * 22 + 1 * 21 + 1 * 20
= 0 * 128 + 0 * 64 + 1 * 32 + 1 * 16 + 1 * 8 + 0 * 4 + 1 * 2 + 1 * 1
= 0 + 0 + 32 + 16 + 8 + 0 + 2 + 1
= 32 + 16 + 8 + 2 + 1
= 59
So 00111011b (or simply 111011b) is equal to 59 in decimal.
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You cannot convert a decimal into a decimal!
0.2 already is a decimal. There is nothing to convert.0.2 already is a decimal. There is nothing to convert.0.2 already is a decimal. There is nothing to convert.0.2 already is a decimal. There is nothing to convert.
Convert 29.53 to decimal
If the number is already in decimal form, you do not need to do anything to "convert" it to decimal!
9.80 IS a decimal so to convert it to a decimal you, very carefully, leave it exactly as it is.