Students’ learning and performance in mathematics is affected by several factors, including students’ attitude. This paper aims to understand the gender differences in attitude toward mathematics and mathematics achievement. A descriptive survey design was used, and the participants consisted of 360 Junior High School students. Two instruments, semi-structured questionnaire and students test scores were used. The results revealed that, in general, both female and male students held positive attitudes towards mathematics, and there was no significant difference in attitudes between genders toward mathematics. However, the results established that there was a significant difference in achievement. It was recommended that to achieve sustainable development goal 4, teachers, parents, and educational authorities should develop creative and innovative ways of helping students, especially female students to build self-confidence in the learning of mathematics.