The "Mental Arithmetic Book 4 Answers: Year 5, Ages 9-10" by R P Beaumont is a 48-page paperback book designed for students aged 9-10. Published by Schofield & Sims Ltd in 2016, it provides answers to the questions in the corresponding Mental Arithmetic Book 4, offering a comprehensive educational resource for adults and university students who are looking to improve their mental arithmetic skills. The book is written in English and is a valuable addition to any educational library, particularly for those studying or teaching Year 5 students.