Does anyone want to learn Arabic language ?

Each century has 100 years. 1/3 one third 2/3 thirds 3/3 thirds 100/3=33.3 The 19th century is from 1800 to 1899 In this case, the first two thirds would be until 1866 approx and the rest so from 1866 to 1899 would be the last third

It means approx the years 1866-1899