To insert ration no.s between any two numbers, u just need to add them n divide the sum by 2.
7+8/2= 15/2 = 7.5
then, add the coming answer with either any of the two numbers, like we add here 7.5 and 7 and then as the above divide it by 2
7 + 7.5 = 14.5/2 = 7.25
then repeat this process again by adding the coming sum with any of the added numbers, but remember that the coming sum of the last step should be added in further steps
7.25 +7.5 = 14.75/2= 7.375
hope U GOT IT