Quick check
Tap a Spanish word, then its English partner
The adjective copies the noun, twice over
English adjectives never move: "the yellow banana", "the yellow bananas". Spanish adjectives copy the noun's gender and its number.
El platano es amarillo. Los platanos son amarillos. La lechuga es verde. Las lechugas son verdes.
Adjectives that end in -e or a consonant have no separate feminine: verde, gris, interesante, tropical. They still take a plural: grises, tropicales.
The trap: the adjective normally goes after the noun. Una comida deliciosa, not una deliciosa comida.
cien, ciento, and the y that only joins the last two
100 on its own is cien. With anything after it, it becomes ciento: ciento treinta y tres.
Hundreds are one word: doscientos, trescientos, cuatrocientos, quinientos, seiscientos, setecientos, ochocientos, novecientos.
y joins only the tens to the units: mil novecientos cuarenta y siete. Never between hundreds and tens.
The trap: quinientos and setecientos are irregular. It is not cincocientos or sietecientos.
Not every adjective fits every noun
The class exercise is a matching grid, not a translation. A clima can be seco, templado, humedo, tropical. A pais can be poblado, turistico, famoso. A comida can be tipica, deliciosa, conocida.
Some cross over: frio works for a climate and a mountain, conocido for a mountain, a country and a food.
The trap: the exam asks for a combination that makes sense, so a grammatically perfect una comida poblada still scores nothing.