Answer:
learned
Explanation:
also learnt is grammatically correct
First convert them all to one category of numbers (for lack of a better explanation), like decimals. So 75% because .75, 1/2 becomes .5, 0.375 stays the same, and 5/8 becomes 0.625
So, if you want the answer from least to greatest it would be
0.375, 1/2, 5/8, 75%
