Typically a number is used to represent the exact amount of things you are counting. Numbers in telephone numbers actually don't count anything and were just a convenient way to categorize lines.
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There are an infinite number of ounces and it would require an infinite amount of time to represent each one of them separately.
Each bar represents 5 and a dot represent 1
You represent a repeating number by putting a dash on top of the number. For example 56.1066666 you represent it by putting a dash on top of the 6
The letter that represent the composite number is letter C.
8.3 is not a whole number and so cannot represent any whole number.