To write 3.0035 as a fraction you have to write 3.0035 as numerator and put 1 as the denominator.
Now you multiply numerator and denominator by 10 as long as you get in numerator the whole number.
3.0035 = 3.0035/1 = 30.035/10 = 300.35/100 = 3003.5/1000 = 30035/10000
And finally we have:
3.0035 as a fraction equals 30035/10000