Dear Rodrigo,
It was nice to read your message! My name is [Your Name] and I'm [Your Age] years old. I live in [Your Country/City].
It's interesting that your favourite subjects are maths and science. My favourite subjects are [Your Favourite Subjects]. I also like [mention a sport or hobby you like].
In my free time, I like to [mention your hobbies, e.g., read books, play video games, hang out with friends]. At weekends, I usually [mention your weekend activities]. I also enjoy [mention something you enjoy doing].
To answer your questions: My name is [Your Name]. I am [Your Age] years old. I like [mention things you like]. I often [mention things you do at weekends].
I'm looking forward to hearing from you!
Best wishes,
[Your Name]