Question

find 5 rational numbers between _2/5 & 1/2

Answer 1

For the numbers -2/5 and 1/2, the LCM is 10(from the denominators 5 and 2, we get 5*2=10)

so:
-2/5 = -4/10 = -8/20
1/2 = 5/10 = 10/20

so the rational numbers lying between -2/5 and 1/2 = the rational numbers lying between -8/20 and 10/20

= -7/20, -6/20, -5/20, -4/20, -3/20, -2/20, -1/20, 1/20, 2/20, 3/20