He is a math teacher.

He is a Math teacher.

Do I have to capitalize Math or not? are both OK?

The only time you capitalize the M on "math" is when the word is part of the actual title of a course. Here are some examples:

He is studying algebra.
She is enrolled in Algebra I.

They are working on their math homework.
They are taking the Discrete Mathematics class.

So ...
He is a math teacher.
He teaches Mathematics IV.
She studies Math IV.

=)

Is it, "Our math teacher, Mrs. Light..." or "Our math teacher, Mrs. Light..." ???

Well, it's all about adding a little "sum"thing extra to your writing! Technically, both "math" and "Math" are acceptable, but it really depends on which side of the equation you're on. American English typically capitalizes "Math" when referring to the subject as a whole, while British English usually keeps it lowercase as "math." So, whether you want to go with "math" or "Math," just remember to always have a blast "adding" some numbers into your writing!

Both options are technically acceptable, but it depends on the style guide or preference of the institution or publication you are writing for.

In general, when "math" is used in a general sense to refer to the subject of mathematics, it is not capitalized. For example, "I am studying math at university."

However, when "math" is used as part of a proper noun or title, such as in "Math Teacher" or "Mathematics Department," it is capitalized. So, "He is a Math teacher" is correct if you are referring to the specific title of his job.

Both capitalizations, "math" and "Math," can be considered correct depending on the style guide or personal preference you are following. However, there is a general guideline to follow when it comes to capitalizing subjects or disciplines.

In most standard English writing, the capitalization rules state that you should not capitalize subjects or disciplines unless they are part of a title or are considered proper nouns. For example, "I am studying math" would be lowercase, but "I am taking a course called Math 101" would be capitalized.

That being said, some people or style guides may prefer to capitalize "Math" in order to emphasize its importance or to treat it as a distinct and specific subject. So, if you are following a specific style guide or have personal preference, it is best to adhere to those guidelines.