Beast Academy: Math 2D (Guide)
Recommended for students ages 7‑9.
Beast Academy provides a fun, rigorous, challenging, complete curriculum for aspiring math beasts. BA Level 2D includes chapters on big numbers, algorithms, and problem solving.
The Guide book is written in an engaging comic book style, and the Practice book provides over 400 problems ranging from introductory level exercises to very challenging puzzles and word problems.