You would say "el veinticinco de enero". Remember that the names of the months are not capitalized in Spanish.
su cumpleaños es el 1 de abril
Abril.
El primero de abril
You can say "No Abra hasta el 4 de abril". Note that the names of the months are not capitalized in Spanish.
You can say, "Mi cumpleaños es el 11 de abril" in Spanish. This translates directly to "My birthday is on the 11th of April."
The number one in Spanish is uno.
abril. Note it is not normally capitalized, except at the beginning of a sentence.
"20 de abril"
Álgebra 1
1 25
The month "April" is abril in Spanish.
Vacaciones de Semana Santa Vacaciones de abril