YOU SAID:
i never understood maths
INTO JAPANESE
数学が理解できなかった
BACK INTO ENGLISH
I didn't understand mathematics
INTO JAPANESE
数学が理解できませんでした
BACK INTO ENGLISH
I didn't understand math
INTO JAPANESE
数学が理解できませんでした
BACK INTO ENGLISH
I didn't understand math
That didn't even make that much sense in English.