YOU SAID:

I think i failed that math test

INTO JAPANESE

私はその数学のテストに失敗したと思う

BACK INTO ENGLISH

I think that math test failed

INTO JAPANESE

数学のテストは失敗したと思う

BACK INTO ENGLISH

I think the math test failed

INTO JAPANESE

数学のテストは失敗したと思う

BACK INTO ENGLISH

I think the math test failed