How to Say "three hundred" in Spanish
The Spanish word for “three hundred” is “trescientos” — A1 level. This is a very common word in everyday Spanish.

Examples
Hay trescientos estudiantes en mi escuela.
There are three hundred students in my school.
Este libro tiene exactamente trescientos páginas.
This book has exactly three hundred pages.
El billete de avión costó trescientos euros.
The plane ticket cost three hundred euros.
Matching the Gender
This word changes its ending depending on whether you are talking about masculine or feminine things. Use 'trescientos' for men/masculine objects and 'trescientas' for women/feminine objects.
Placement
Just like in English, put 'trescientos' directly before the person or thing you are counting.
Don't split the word
Mistake: “tres cien”
Correction: trescientos (It must be written as one single word in Spanish).
Avoid using 'de' with nouns
Mistake: “trescientos de libros”
Correction: trescientos libros (You don't need 'of' between the number and the noun).
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