From least to greatest 0.5,1/5,0.35,12/25,4/5

well we know that

0.5 = 0.5

1/5 = 0.2

0.35 = 0.35

12/25 = 0.48

4/5 = 0.8

so, your first number would be 1/5 because it's the least then 0.35 then 12/25 then 0.5 and last but not least 4/5

your answer is 1/5, 0.35, 12/25, 0.5, 4/5