5/6 is 1/6 away from 1
while 5/8 is 3/8 away from 1
Next, 3/8>2/8
(2/8=1/4)
So, 5/8 is more than 1/4 away from 1
Because 1/4>1/6
--> 5/8 is farther away from 1 than 1/6
Thus, 5/8 is smaller.
A shortcut I've been taught is attached
Explanation of attached file:
40 is above 5/6
while 30 is above 5/8
since 40>30 --> 5/6>5/8
Hope this helps!