YOU SAID:

Maths is not that fun

INTO JAPANESE

数学はそんなに面白くない

BACK INTO ENGLISH

math is not that interesting

INTO JAPANESE

数学はそれほど面白くありません

BACK INTO ENGLISH

math is not that fun

INTO JAPANESE

数学はそれほど楽しいものではありません

BACK INTO ENGLISH

math is not that fun