The first number corresponds to 13/8 and it can't be simplified.
The second number corresponds to 14/8 and simplified by 2 its 7/4.
The third number corresponds to 19/8 and it can't be simplified.
The fourth number corresponds to 20/8 equal to 10/4 equal to 5/2.
And the last one corresponds to 21/8 and it can't be simplified.