2/5, 1/2, 6/10 is the order from these fractions from least to greatest.
To solve this problem, we must put all of the fractions into a common denominator. In this instance, we shall choose 10.
2/5 = 4/10
1/2 = 5/10
6/10 = 6/10
Therefore, because we now have all the fractions in a common denominator, we know that 4<5<6, so the fractions should be arranged in the order above.