Studies show that your mathematical abilities can be improved with brain training
Study: Does improving your working memory lead to better mathematical abilities?
Results: The study examined children with low working memory capacity and found training to improve working memory substantially, with these results being evident 6-months after training.
Source: Holmes J., Gathercole S. E., Dunning D. L. (2009). Adaptive training leads to sustained enhancement of poor working memory in children. Dev. Sci. 12, F9–F15. doi: 10.1111/j.1467-7687. 2009.00848.x