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From this we know that
42 will not be a finance-related category. This is the power of the system: you know where you absolutely should
not bother looking to find your data.
Now we bring in the numbers
A Johnny.Decimal number looks like this:
42.1812.0363.17
They’re always two digits, a decimal point, and two more digits.
Say it like “forty-two eighteen” or “twelve dot oh-three”.
Before the decimal: category
The decimal point is there to break the number up, but more importantly to remind you that
the number before the decimal is the important part. It’s the category.
The category tells you which area it’s in, because all areas start with the same number. If your category starts with the digit