(i) The prime numbers between 10 and 50 are 11, 13, 17, 19, 23, 29, 31, 37, 41, 43 and 47.
(ii) The prime numbers between 70 and 90 are 71, 73, 79, 83 and 89.
(iii) The prime numbers between 40 and 85 are 41, 43, 47, 53, 59, 61, 67, 71, 73, 79 and 83.
(iv) The prime numbers between 60 and 100 are 61, 67, 71, 73, 79, 83, 89 and 97.