Oh, dude, in French, "maths" is short for "mathématiques," which is a feminine noun, so you would use "les maths" with the feminine article "les." But hey, don't stress about it too much, language can be a bit random sometimes. Just roll with it and keep on math-ing, or should I say, math-ématiquing?
masculine
The word maths is feminine in French. The diminutive in question serves as an affectionate nickname - "math" in English - for the feminine plural noun mathématiques("mathematics"). The pronunciation will be "ma-tey-ma-teek" in French.
Un escalier is a masculine noun in French. Note that it is commonly used in the plural: "les escaliers"
les maths, les mathématiques
its feminine
"Les légumes" is masculine in French.
In French, "les cheveux" is masculine.
"Les fraises" is feminine in French.
masculine
"Les chips" is considered a feminine noun in French.
In French, "garbage" is masculine and is translated as "les ordures" or "les déchets."
"Les trousers" is masculine in French. The word for "trousers" in French is "le pantalon," which is a masculine noun.
The Spanish word "puertas" is feminine, and plural.
"Les joues" is a feminine noun in French.
In French, the word "biscuits" is masculine. This is because it is preceded by the masculine article "les." In general, nouns ending in -s in French are typically masculine.
La pomme is feminine singular, les pommes feminine plural
Les devoirs is masculine/plural.