Great math books in new condition. Didn’t get around to using these with my kids. From BA website: Recommended for students ages 9‑12. Beast Academy provides a fun, rigorous, challenging, complete curriculum for aspiring math beasts. BA Level 4C includes chapters on factors, fractions, and integers. BA Level 4D includes chapters on fractions, decimals, and probability. The Guide book is written in an engaging comic book style, and the Practice book provides over 500 problems ranging from introductory level exercises to very challenging puzzles and word problems.