★ 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　Finding Patterns (I)
Week 02　Finding Patterns (II)
Week 03　Simple Reasoning
Week 04　Problem Solving (I)
Week 05　Number-Sentence Puzzles (I)
Week 06　Number-Sentence Puzzles (II)
Week 07　Optimal-Strategy Problems
Week 08　Clever Summation (I)
Week 09　Change Patterns (I)
Week 10　Change Patterns (II)
Week 11　Correcting Errors to Solve
Week 12　Simple Enumeration
Week 13　Sum-and-Multiple Problems
Week 14　Tree-Planting Problems
Week 15　Plane-Figure Area Problems
Week 16　Clever Summation (II)
Week 17　Counting Figures (I)
Week 18　Counting Figures (II)
Week 19　Problem Solving (II)
Week 20　Speed & Clever Calculation (I)
Week 21　Speed & Clever Calculation (II)
Week 22　Average Problems
Week 23　Defined Operations
Week 24　Difference-and-Multiple Problems
Week 25　Sum-and-Difference Problems
Week 26　Clever Age Calculation
Week 27　Sum-Difference-Multiple Problems
Week 28　Periodic Problems
Week 29　Motion Problems (I)
Week 30　Assumption Method
Week 31　Reverse-Working Problems
Week 32　Logical Deduction
Week 33　Speed & Clever Calculation (III)
Week 34　Motion Problems (II)
Week 35　Inclusion–Exclusion Problems
Week 36　Binary Problems
Week 37　Problem Solving (III)
Week 38　Problem Solving (IV)
Week 39　Profit-and-Loss Problems
Week 40　Open-Ended Math Problems