Mystery in the sea. Level 2. Grade 2 and up. eBook

“Mystery in the Sea” is the second book of the series. It contains 35 questions. This book is designed for students in Grade 3 and up who want to take their knowledge of simple addition, subtraction, and problem solving to another level.

It follows a pair of octopuses that are on a mission to investigate the theft of a diamond. It also lets children learn some scientific facts about marine creatures and their habits while they develop a love of reading and math.

The illustrations, story, and math questions appeal to all types of intelligences so that everybody can find something interesting. This book is translated and published in China.