★ A Bestselling Educational IP with Over 20 Years of Enduring Success!
First published in 2002, this series has been a consistent bestseller in the Chinese market for over two decades, with global cumulative sales exceeding 10 million copies. It has weathered multiple economic and educational policy cycles, remaining a perennial "evergreen" atop educational supplement bestseller lists. Its official recognition as a "National Bestseller of Excellence" further certifies its significant market influence.

★ What is the Core Competency Most Essential for Building a Child's Learning Foundation?
When your child learns to solve one problem, they acquire a method. When your child masters the ability to "Learn One and Apply to Three", they gain structured thinking, the transferable skill of drawing inferences, and resilience in tackling complex problems. This series does more than teach mathematical techniques; it systematically trains a child's "thinking muscles" through its meticulously designed "one model problem, three practice exercises" progressive framework. This aligns perfectly with the internationally emphasized educational concepts of "Problem-Solving Skills" and "Growth Mindset".

The series currently comprises 12 volumes:
Version A: Grade 1, Grade 2, Grade 3, Grade 4, Grade 5, Grade 6
Version B: Grade 1, Grade 2, Grade 3, Grade 4, Grade 5, Grade 6

This is a comprehensive and uniquely methodological system designed for training primary school students' mathematical thinking. It primarily targets pupils (typically Grades 1-6) who wish to expand their mathematical thinking and cultivate an interest in problem-solving.

Core Structure & Philosophy:
The series' most renowned feature is its deep-learning model of "One Model Problem, Three Practice Exercises; Learn One and Apply to Three." Each knowledge unit revolves around a classic "Model Problem," accompanied by detailed thought-navigation. This is followed by three carefully structured "Practice Exercises": the first reinforces the method through imitation; the second alters conditions to guide skill transfer; the third offers integrated expansion for innovative challenge. This design compels active mental processing and pattern recognition, moving beyond passive imitation, which is key to internalizing abilities.

Product Formats & Evolution:
The series is primarily divided into Version A and Version B. Version A focuses on "Daily Learning," offering one model problem with three exercises per day for steady, accumulative understanding. Version B emphasizes "Weekly Practice," providing comprehensive test papers for periodic consolidation and skill assessment. Used together, they form a complete loop of instruction, practice, and evaluation.

Problems It Solves:
It aims to bridge the gap between standard school mathematics curriculum and the cultivation of higher-order mathematical thinking. By engaging with refined, thought-provoking problems, students can move beyond mechanical calculation, appreciate the beauty of mathematical logic, and hone core cognitive abilities such as analysis, reasoning, induction, and reverse thinking.

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.

Week 01　Counting Figures
Week 02　Finding Patterns
Week 03　Clever Addition & Subtraction
Week 04　Inserting Symbols Wisely
Week 05　Number-Sentence Puzzles
Week 06　Word Riddles
Week 07　Number-Fill Games
Week 08　Division with Remainders
Week 09　Periodic Problems
Week 10　Math Puzzles
Week 11　Matchstick Games
Week 12　Multiplication Speed-Up
Week 13　Clever Multiplication & Division
Week 14　Problem Solving (I)
Week 15　( title missing )
Week 16　Tree-Planting Problems
Week 17　Number Trivia
Week 18　Overlap Problems
Week 19　Simple Enumeration
Week 20　Equivalent Substitution
Week 21　Correcting Errors to Solve
Week 22　“One-to-One” Problem Solving
Week 23　Profit-and-Loss Problems
Week 24　( title missing )
Week 25　Sum-and-Multiple Problems
Week 26　Difference-and-Multiple (I)
Week 27　Difference-and-Multiple (II)
Week 28　Sum-and-Difference Problems
Week 29　Age Problems
Week 30　“Reverse” Problem Solving
Week 31　“Assume” Problem Solving
Week 32　Average Problems (I)
Week 33　Average Problems (II)
Week 34　Simple Reasoning (II)
Week 35　Clever Perimeter (I)
Week 36　Clever Perimeter (II)
Week 37　Area Calculation
Week 38　Optimal Arrangement
Week 39　Pigeonhole Principle
Week 40　Final Test (II)