Question

how do you answer "te gusta la clase de matematicas tanto como la clase de espanol? por que?" in spanish

Answer 1

First of all the verb "gustar" is the verb meaning "to be pleasing....." and therefore will always state to WHOM one thing IS pleasing or two + ARE pleasing. The question asks: Is Math class as pleasing to you as Spanish class? (freely translated: Do you like math class as much as Spanish class?) IF the answer is yes:
Sí, me gusta la clase de matemáticas tanto como la (clase) de español. BUT. of the answer is no: No, no me gusta la clase de matemáticas tanto como la (clase) de español.

Sra