The Math Your Earth Science Majors Need (https://serc.carleton.edu/mathyouneed/geomajors) has developed, tested, and published 14 free, online, co-curricular modules designed to strengthen Earth science majors' quantitative skills. Each module situates core mathematical and statistical concepts such as exponential equations, vectors, histograms, and probability within authentic geoscience problems drawn from multiple sub‑disciplines. The goal is to help students bridge the gap between general math preparation and the applied quantitative skills required for success in upper‑level courses and geoscience careers. Faculty often assign the modules as homework or a pre-lab before students have to apply the quantitative skill in a course.

The modules were created and classroom‑tested by geoscience faculty. Pre‑ and post‑test data from 351 students in 29 courses across 20 institutions show significant gains in both quantitative performance and math self‑efficacy in geoscience contexts. Average scores increased from 57% to 78%, and students who began with the lowest performance demonstrated the largest normalized gains, indicating that the modules help "level the playing field." Skill-focused analyses indicate that all specific skills addressed by the modules contributed to these improvements in performance on the post-test.

To support adoption, the project offers multiple implementation resources. All modules are freely available and have been accessed by more than 89,000 visitors since August 2023. Auto‑gradable quizzes aligned with each module can be imported into Canvas, Moodle, or D2L to streamline and support formative assessment. A comprehensive instructor guide and module‑specific teaching notes provide strategies for integrating the materials into a variety of course structures (https://serc.carleton.edu/mathyouneed/geomajors/about/instructor.html).