★ 185 core mathematical concepts have been successfully transformed into 185 adventure stories! This allows children to naturally grasp essential math concepts, from basic operations to logical thinking, through enjoyable reading, subtly cultivating a mathematical mindset that will benefit them for life.

★ Each book is enhanced with mathematical diagrams and exquisite illustrations, and features carefully designed interactive sections like "Math in Action Games" and "Brain Teaser Puzzles" (19 games + 47 puzzles in total). It also comes with scannable QR codes for listening to audio recordings of the stories.

★ Mathematics is a wondrous world waiting to be explored, filled with stories, puzzles and treasures.

This 6-volume series aims to build a complete, engaging, and systematic mathematical world for primary school children.

The core innovation of the series lies in transforming 185 key mathematical knowledge points into 185 independent adventure stories. Children will follow the protagonists as they travel through time and space, solve puzzles, and explore secret realms. They will learn the rules of arithmetic in the "Kingdom of Numbers," discover the mysteries of shapes in the "Castle of Geometry," and hone their reasoning and problem-solving skills in the "Labyrinth of Logic."

Each volume is scientifically graded according to the difficulty of concepts, ensuring progressive learning. The books not only tell stories with vivid language but also use clear mathematical charts and beautiful full-color illustrations to visualize abstract concepts, revealing the connections between ideas and significantly lowering the barrier to understanding.

Beyond the exciting storylines, the books feature two major interactive sections: "Math in Action Games" and "Brain Teaser Puzzles." Children can reinforce their knowledge through 19 fun, hands-on games and expand their thinking by tackling 47 classic puzzles. Additionally, professionally narrated audio is available to accompany the text.

This series shows children that mathematics is not just symbols on a classroom blackboard, but a master key for solving real-world problems and understanding how the world works.

The R&D Team

This is a dedicated collective comprised of senior education experts, teaching researchers, and frontline teachers with extensive experience in competition coaching. They possess a deep understanding of the cognitive development patterns of primary school children and have accurately pinpointed the intersection between China's basic education curriculum standards and advanced skill development. The team's core work goes beyond mere compilation of exercises; it involves "educational design". Everything from the overall curriculum planning and gradient setting of teaching progressions to the strategic arrangement of each model problem and practice exercise undergoes repeated scrutiny to ensure the efficacy of its methodology (the "modular" teaching model). This approach of driving product innovation through professional pedagogical research guarantees the content's foresight and practicality.

Part 1
I. Hours, Minutes & Seconds
  Lesson 1　Understanding h-min-s　–　The Bell-Stealing Crow
  Lesson 2　Calculating Elapsed Time　–　Password Forest
  Lesson 3　Smart Time Planning　–　Dr. Owl’s Inn
  Math Fun　Integrated Activity (p.16)
II. Measurement
  Lesson 4　Millimetres & Decimetres　–　Ruler-of-Heaven Castle
  Lesson 5　Kilometres　–　Crazy-Animals Sports City
  Lesson 6　Tonnes　–　Gold-Digging Giant Valley
III. Addition & Subtraction Within 10 000
  Lesson 7　Checking 10 000 +/-　–　Sweet-Tiny Town
  Lesson 8　Clever 10 000 +/-　–　Princess Rose’s Flowers
  Lesson 9　10 000 +/- Puzzles　–　The Magician’s Mall
  Math Fun　Integrated Activity (p.45)
IV. Understanding “Times” (Multiples)
  Lesson 10　Sum-and-Multiple Problems　–　Monkey King’s Orchard
  Lesson 11　Difference-and-Multiple Problems　–　Five-Colour Dragon Palace
  Lesson 12　Sum-Difference-Multiple Problems　–　Magic-Dye Village
  Math Fun　Integrated Activity (p.61)
V. 2/3-Digit × or ÷ by 1-Digit
  Lesson 13　2/3-digit × 1-digit　–　Small-Estimate Cave & Big-Estimate Cave
  Lesson 14　2/3-digit ÷ 1-digit　–　Spore Ancient City
  Math Fun　Integrated Activity (p.70)
VI. Perimeter of Shapes
  Lesson 15　Perimeter of Squares　–　Rubik-Elf Village
  Lesson 16　Perimeter of Rectangles　–　Cat-Gold City
  Lesson 17　Perimeter of Irregular Shapes　–　Beaver Town & Wishing Spring
  Math Fun　Integrated Activity (p.86)

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Part 2

I. Position & Direction
  Lesson 1　North, South, East, West　–　Road-Building Lychee Mountain
  Lesson 2　Eight Directions　–　Grass-Cushion Kingdom
  Math Fun　Integrated Activity (p.96)
II. Division by One-Digit Divisors
  Lesson 3　Clever Division　–　Tiger-Paw Town
  Lesson 4　Checking Division　–　Legend of Drifting Island
  Lesson 5　Estimation Strategies　–　Devil’s Great Whirlpool
  Math Fun　Integrated Activity (p.110)
III. Compound Statistical Tables
  Lesson 6　Compound Tables　–　Landing on Drifting Island
IV. Two-Digit × Two-Digit
  Lesson 7　Clever Multiplication　–　Mushroom-Lychee Tower
  Lesson 8　Consecutive Multiplication　–　Parking House
  Math Fun　Integrated Activity (p.126)
……