Difficulties faced in learning a specific mathematical vocabulary are amplified through incomplete English knowledge among students who English Language Learners (ELLs). Therefore, the present study aims to investigate the relationship between English language anxiety and the mathematical achievement of EFL/ESL students who are using EMI. Mixed research method was employed to identify and understand this relationship between language anxiety and mathematics achievement in the math classroom. To collect quantitative data, a questionnaire was distributed to the students to measure their level of English language anxiety and mathematics achievement using their grades in their mathematics classes. The association between English language anxiety levels and ESL/EFL achievement in Mathematics was investigated through Pearson's correlation test. The results showed medium levels English language anxiety among the EFL/ESL students with a mean of (2.15) and a standard deviation of (0.73). The results indicated no statistical difference in means of English language anxiety that can be attributed to the program type or graduation year (a= 0.05). The study concluded that English language anxiety was neutral as majority of students become nervous, when the teacher asks them unexpected questions.