The part of the sentence "in the math" is correct and usable in written English.
You use it to refer to a subject or activity related to math. For example: My son is struggling in the math this semester.
Penney's argues its proof is in the math.
"He's someone who's a legend in the math community".
(Of course, this tactic didn't serve me well in the math portion, as my scores attest).
A consensus was emerging in the math community: Perelman had solved the Poincaré.
That means there will be some wiggle room in the math.
"It's all in the math," said Jimmy A. Thomas, the lead mechanical designer.
Both sides in the math wars claim Dr. Ma as their own.
"Maybe he'll do so well in the math and science portions that it will make up for the English".
He caught a fleeting glimpse of God in the math here, in the infinitesimal duration of a life.
White Americans fared better than the multicountry average in literacy, but were about average in the math and technology tests.
And of the 10,052 who scored an 800 in the math section, 69 percent were boys.
