Answer :
You can convert the fractions into decimals or give them the same denominator:
Method 1)
1/5 = 0.2
2/3 = 0.666
5/8 = 0.625
Answer: 1/5, 5/8, 2/3
Method 2)
1/5 = 24/120
2/3 = 80/120
5/8 = 75/120
Answer: 24/120(1/5), 75/120(5/8), 80/120(2/3).
Method 1)
1/5 = 0.2
2/3 = 0.666
5/8 = 0.625
Answer: 1/5, 5/8, 2/3
Method 2)
1/5 = 24/120
2/3 = 80/120
5/8 = 75/120
Answer: 24/120(1/5), 75/120(5/8), 80/120(2/3).
The easiest way would be to convert the fractions into decimals.
1/5 = .2
2/3 = .666666
5/8 = .625
So from least to greatest would be 1/5, 5/8 , 2/3
Another way would be to find the common denominator
1/5 = 24 /120
5/8 = 75 /120
2/3 = 80 /120
And as you can tell from your numerators 24, 75, 80 that would be the order from least to greatest.
Hope I was able to help you understand. :-)