Latin Numbers Correspond by Gender! Latin Talk
I have never seen this in a language before. Even in Spanish, French and Italian, the only number that changes by gender is one.
How's everyone else going with Latin? I'm doing great! What have you learned to say?
EDIT: Only for the numbers two and three sorry
Unus, duo and tres, and the hundreds (centum, ducenti, etc.) decline by gender and case. So, 3x5 forms each. (Though not 15 different forms each.)
You can get a fuller overview here, under 'numerals': http://www.thelatinlibrary.com/bennett.html#sect78