"Matematika adalah ilmu yang penting."

Translation: Mathematics is an important science.

[jmaddz]

"Mathematics is important knowledge"should be accepted.

[arielkbt]

Yeah, we generally consider math to be a separate subject from science so this sounds weird.
Perhaps: "Mathematics is an important field."

[arielkbt]

I asked my Indonesian friend. She says "subject" can also be used as a translation for "ilmu".

[tsuj1g1r1]

Memanggil hal yang bukan pengetahuan alam “science,” itu aneh; menurut saya, “discipline” adalah terjemah yang paling benar.

[donny309620]

Mathematics, Science and Technology (MST) - these are separate fields of study.