Numeric questions use a numeral for a response rather than a multiple choice option. There are two kinds, the very common Numeric Free Response (NFR, also called Open), and the Algebraic Free Response, which offers a pallet to select functions from.
Numeric Free Response (template #174705):
Algebraic Free Response (template #179792. Notice how variables are expected in the answer, in this case, 'mx+b')
Question tolerance
The answer tolerance for a question can be set in the right-hand box above the code portion of a TeX question. Only one tolerance can be set for the entire question and applies to all of the question's parts. For any numerical response, a student's submission may be within this tolerance range (+/-) and still be considered correct. The default tolerance for most numerical response questions is 1%. For instance, if a given question has an answer of 32.00 and a tolerance of 1%, a student's response could be between 31.68 and 32.32. A 1% tolerance can usually cover most student rounding errors.