¡Hola! ¿Qué tal?

[DeterminadoAprender]

!Mucho gracias por el mano Rusty!

[Rusty]

!Mucho gracias por el mano Rusty!

To give a hand (to somebody)
= Echarle una mano (a alguien)

So,
¡Muchas gracias por echarme una mano!

¡De nada!

[CrOtALiTo]

For example: I give you a hand, it's correct.

[Rusty]

For example: I give you a hand, it's correct.

If you're asking if your example sentence is correct (and if you're translating "Te echo una mano."), it is better to say:
I'll give you a hand. -or-
I'm giving you a hand.

[DeterminadoAprender]

Is the word "número " only masculine or can it be feminine?

[Rusty]

Is the word "número " only masculine or can it be feminine?

It is always masculine.

You bring up a good point, however, because there are some nouns which can be both, especially those that refer to persons, occupations or character. A good dictionary will clearly mark these nouns.

[CrOtALiTo]

Thank you very much, when you want I'll give you a hand with your Spanish.

[DeterminadoAprender]

?Que significa comunes en ingles? Significa es "common"???

Aqui es frase:
"...las residencias de estudiantes son mas (accent on "a", meaning "more") comunes..."

To determine the gender of a word, does it correspond with the noun being described?

Por ejemplo:
She has a good male dog.
Ella tiene un bueno perro. VS Ella tiene una buena perra.
Is "Ella tiene un bueno perro." grammatically correct?

[Rusty]

¿Qué significa comunes en inglés? ¿Significa es "common"?

Sí. Es la forma plural del adjetivo. Refiere a las residencias. Los adjetivos siempre concuerdan con los sustantivos que modifican, en género y número.
Yes. It's the plural form of the adjective. It refers to the residences. Adjectives always agree with nouns they modify, in gender and number.

Aquí es la frase:
"...las residencias de estudiantes son más comunes..."

To determine the gender of a word, does it correspond with the noun being described? Your question is about adjectives, not words. I answered this question above.

Por ejemplo:
She has a good male dog.
Ella tiene un buen[s]o[\s] perro.
VS Ella tiene una buena perra. (female dog)


Ella tiene un buen perro.
Ella tiene una buena perra.
Ella tiene un perro bueno.
Ella tiene una perra buena.

Most of the time adjectives follow the noun they modify. As I stated above, the adjective must agree in gender and number with the noun it modifies. When certain masculine adjectives precede a noun, the final o is dropped.
Certain adjectives always precede the noun. Others can precede or follow, but have a different meaning depending on placement. These you'll have to learn. There are too many nuances to discuss them here.

[Rusty]

By the way, it would be easier for those of us who search the forums if you create a new thread for each question, with a meaningful title. :)