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How many working days in year 1900?
Here is the detail of the calculation:
Because 1900 is not a leap year, it has 365 days.
Let's remove 52 saturdays and 52 sundays. It remains 261 days.
Now, let's remove 9 public holidays that do not fall during a weekend and we obtain 252 working days in 1900.
 Here is the list of these 9 public holidays: 
 
 1. Capodanno : Monday, 1 January, 1900 
2. Lunedì di Pasqua : Monday, 16 April, 1900 
3. Anniversario Liberazione : Wednesday, 25 April, 1900 
4. Festa del lavoro : Tuesday, 1 May, 1900 
5. Ferragosto o Assunzione : Wednesday, 15 August, 1900 
6. Ognissanti o Tutti i Santi : Thursday, 1 November, 1900 
7. Festa di Sant'Ambrogio : Friday, 7 December, 1900 
8. Santo Natale : Tuesday, 25 December, 1900 
9. Santo Stefano : Wednesday, 26 December, 1900 
And here are the 3 public holidays falling on a weekend:
1. Epifania : Saturday, 6 January, 1900 
2. Festa della Repubblica Italia : Saturday, 2 June, 1900 
3. Immacolata Concezione : Saturday, 8 December, 1900