It sounds like the asker needs to read the section in the text to understand fractions.
3.100 in fractions is very easy. To get rid of the decimal point, you divide it by a denominator that is a 1 followed by an equal number of zeros as are after the decimal point. 3.100 becomes 3100 / 1000. 3100/1000 can be reduced to 31/10.
The steps used to convert decimals to fractions are always the same. Learn those steps and you will have a foundational skill for more advanced math.
Another way to do this is by multiplying by a fraction equal to one.
3.100 x (1000 / 1000) = 3100/1000
Learn the math.
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