0.4 = 2/5
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If it's only the '4' that's repeated, then the fraction is 2/45 . If the '.04' is repeated, then the fraction is 4/99 .
No, 04 = 4 whereas 040 = 40. You usually do not put a zero before a non-zero number unless you are using a decimal point. If you meant to use a decimal point, then .04 and .040 are equal although the latter is considered to be more precise because it is accurate to 2 decimal places wheras the former is accurate to only one decimal place.
Smallest 3-digit even number is 100.
If you mean points of (0, 4) and (-8, -1) then the slope is 5/8
Details is discussed on http://arjudba.blogspot.com/2008/04/what-are-difference-between-ddl-dml-and.html