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"Las chicas" is a form of "chica", a noun which is often translated as "girl". "Cuadernos" is a form of "cuaderno", a noun which is often translated as "notebook". Learn more about the difference between "las chicas" and "cuadernos" below.
la chica(
chee
-
kah
)A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
b. chick  (colloquial)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
La chica rubia de la barra tiene un doctorado en Astrofísica.The blond chick at the bar has a Ph.D. in Astrophysics.
2. (old-fashioned) (cleaning lady)
A word or phrase that is seldom used in contemporary language and is recognized as being from another decade, (e.g., cat, groovy).
3. (colloquial) (form of address)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
a.  no direct translation
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
Pues, chica, no sé cómo voy a resolver el problema.Well, I don't know how I'm going to solve the problem.
¡Chica! ¿Qué dices?Wow! Are you serious?
el cuaderno(
kwah
-
dehr
-
noh
)A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
1. (for notes)
a. notebook 
Saquen sus cuadernos y tomen notas.Take out your notebooks and take notes.
Lo que voy a explicar a continuación viene en el examen, así que abran sus cuadernos y tomen notas.What I'm about to explain will be on the test, so open your notebooks and take notes.
2. (exercises)
a. exercise book 
Por favor, hagan los ejercicios en la página 33 de sus cuadernos.Please do the exercises on page 33 of your exercise books.