Immediately to the left of the "decimal" point is 20 or units.to its left is 21 = 2,
to its left is 22 = 4,
to its left is 23 = 8, and so on.
To the right of the "decimal" point, would be 2-1, 2-2 etc.
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With the first number being 1 (not zero), the 25th number is 11001 (base 2). This is 16 + 8 + 1 = 25 (in base ten). Each place value in the binary system is double the value to the right of it.
Almost exactly like the decimal system, but the base is the number 2, instead of the number 10. This refers to the place-value system: in decimal, each digit has a place-value that is 10 times as much as the digit on the right; in binary, the factor is 2. It is helpful if you understand the place-value system in decimal first.
It is the same number: 1. Binary numbers are base-2, with each digit place corresponding to an exponent of 2 rather than 10 in the decimal number system. So that the number 11, which in decimal means 10 + 1, would represent 2 + 1 (3) in the binary system, which can only have the value 0 or 1 in each digit place.
The place value of each digit is b times the place value of the digit to its right where b is the base for the system: whether that is binary, octal, decimal, duodecimal, hexadecimal, sexagesimal or some other value.
A binary number is simply a way of representing a number in such a way that the place value of each digit is two times that of the digit to its right.Similarly, a decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right.