★ 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 1: Finding Differences
Week 2: Drawing According to Patterns
Week 3: Filling in Numbers Following Patterns
Week 4: Cutting and Pasting
Week 5: Drawing with One Stroke
Week 6: Number Riddles (Part 1)
Week 7: Interesting Real-Life Problems (Part 1)
Week 8: Counting and Shapes
Week 9: Problems Involving Spacing
Week 10: The Fire-Violet Stick Game
Week 11: Solving Problems (Part 1)
Week 12: Moving More to Make Up for Less
Week 13: Problems Related to Sum and Difference
Week 14: Interesting Real-Life Problems (Part 2)
Week 15: Cleverly Filling in Symbols
Week 16: Division with Remainder
Week 17: Periodic Problems
Week 18: Multiple-Number Problems
Week 19: Number Riddles (Part 2)
Week 20: Equivalent Substitution (Part 1)
Week 21: Equivalent Substitution (Part 2)
Week 22: Quick and Clever Calculations (Part 1)
Week 23: Quick and Clever Calculations (Part 2)
Week 24: Solving Problems (Part 2)
Week 25: Age Problems
Week 26: Tree Planting Problems
Week 27: The Chicken and Rabbit in the Same Cage Problem
Week 28: Simple Enumeration
Week 29: Cleverly Filling in Numbers
Week 30: Logical Reasoning
Week 31: Splitting Numbers
Week 32: Queuing Problems
Week 33: Clock Problems (Part 1)
Week 34: Clock Problems (Part 2)
Week 35: Numbers and Digits
Week 36: Guaranteed-Winning Strategies
Answers