数学 + Noun
数学 (shùxué) is a noun meaning "mathematics" or "math." It refers to the academic subject or field of study. It commonly appears as a modifier before other nouns like 课 (kè, "class") or 老师 (lǎoshī, "teacher") to specify the subject area.
我从小就对数学很感兴趣。
Wǒ cóngxiǎo jiù duì shùxué hěn gǎn xìngqù.
I've been interested in math since I was little.
他是我们学校的数学老师。
Tā shì wǒmen xuéxiào de shùxué lǎoshī.
He is the math teacher at our school.
这道数学题太难了,我想了半天也没做出来。
Zhè dào shùxué tí tài nán le, wǒ xiǎng le bàntiān yě méi zuò chūlái.
This math problem is too hard; I thought about it for a long time but still couldn't solve it.