(i) In the given number wilt digit is 1
∴ Unit digit of cube of given number will also 1
(ii) In the given number unit digit is 4
∴ unit digit of cube of given number will also 4
(iii) In the given number unit digit is 9
∴ Unit digit of cube of given number will also 9
(iv) In the given number unit digit is 5
∴ Unit digit of cube of given number will also 5