“The Secrets of Mental Math” by Arthur Benjamin is a study guide published in 2011 as part of “The Great Courses” series. This course offers 12 lectures on DVD, each lasting 30 minutes, covering various mathematical concepts and techniques for improving mental math skills. The author, Arthur T. Benjamin, provides valuable insights and demonstrations to help viewers enhance their ability to perform calculations in their head with ease and efficiency. This product is a valuable resource for those interested in honing their mental math skills and understanding the secrets behind rapid and accurate calculations.