Natural number are all the positive integers - the 'counting numbers':
1,2,3,4,5,6,7,8,9,10,11,12, ...
A binary number is written using only two symbols (0 and 1) instead of the normal ten symbols (decimal numbers).
A binary 1 is one, 10 is two, 11 is three, ... 1010 is ten.
All binary numbers (without decimalpoint or fractions) are natural numbers - just written in another way than usual.
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