YOU SAID:

math class is boring when you don't know what you're doing

INTO JAPANESE

何をしているかわからないと数学の授業はつまらない

BACK INTO ENGLISH

Math class is boring if you don't know what you're doing

INTO JAPANESE

何をしているかわからなければ、数学の授業はつまらない

BACK INTO ENGLISH

Math class is boring if you don't know what you're doing