To compare the fractions:
1. 3/8 (<) 5/8
2.3/4 (>) 3/8 —> 3/4 = 3×2/4×2 = 6/8
3. 1/2 (=) 4/8 —> 1/2 = 1×4/2×4 = 4/8
4. 2/5 (<) 5/2 —> 5/2 = 2 1/2
One of the key is to find their common denominator, we can then compare them more clearly.
Hope it helps!