How are Numeric fields with exact length used?

How are Numeric fields with exact length used?

If I create a numeric field with exact length of 3, I can't enter any values unless the value has exactly 3 characters... I thought the exact length parameter would specify the maximum number of digits but it doesn't.  If I want to enter a value of 1 the entry is rejected.

I can't see creating a field for values from 1-9, another for 10-99 and another for 100-999.

Am I missing something?

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