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.
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Every decimal number can be represented by a binary number - and conversely.
Decimal 11 = binary 1011
There is no decimal number for the binary number 13 because 13 cannot be a binary number.
The binary equivalent of the decimal number 63 is 111111.
Expressed in decimal, the binary number 111111010 represents 506.