13 / 10000, since they are coprime.
19/80
1/2500
151/10000
3148 over 10000 in simplest form is 787 over 2500. Divide both the numerator and denominator by the greatest common divisor, which in this case is 4, to simplify the fraction.
8303/10000
7/10000
Well, honey, to write 0.3878 as a fraction, you simply take the decimal and put it over 1 followed by the same number of zeros as there are decimal places. So, 0.3878 as a fraction is 3878/10000. Don't worry, fractions are just fancy pants versions of decimals.
9375/10000 = 15/16
13 / 10000, since they are coprime.
5625/10000 = 9/16
19/400
3423/5000
5/16
21/80
1699/2000
11/5000