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Questions & Answers about La moto es grande.
Why is it la moto and not el moto if it ends in "o"?
Even though it ends in an "o", moto is a feminine noun because it is short for la motocicleta. In Spanish, shortened words usually keep the gender of their full version. Another common example is la foto (short for la fotografía).
Should grande change to granda to match the feminine noun la moto?
No, you don't need to change it. Adjectives that end in "e", like grande or inteligente, are gender-neutral. They stay exactly the same whether they describe a masculine or a feminine noun.