Number of times ‘5’ appear from 1 to 100 = 20 Number of times ‘5’ appear from 101 to 200 = 20 Similary, number of times ‘5’ appear from 201 to 499 = 60 Number of times '5' appear from ‘600 to 1000’ = 80 Number of times ‘5’ appear from ‘500 to 599’. = 120 Total number of times ‘5’ appear from 1 to 1000 = 20 + 20 + 60 + 80 + 120 = 300