N.M. Code R. § 6.64.19.8
A. Teachers seeking to add an endorsement as an elementary mathematics specialist to an existing New Mexico level two or level three-A teaching license shall meet the following requirements:
B. Teachers seeking to add an endorsement as an elementary mathematics specialist shall do so through one of the following pathways:
(1) Provide evidence of five years of relevant work and professional learning experience in K-8 mathematics that is approved by the department. Candidates are required to provide demonstration of experience by submitting a resume and at least three verification letters stating the candidate has at least five years of relevant work and professional learning experience in the area of mathematics, mentoring educators in K-8, and participates in ongoing learning, which can be submitted from the following individuals:
[6.64.19.8 NMAC – N, 9/15/2020]