After over 20 years, 7 days a week of researching on creating of math, chess, and puzzles workbooks, Ho Math Chess has made a revolutionary innovation in creating math worksheets. This long, tremendous, and practical teaching experience have helped us develop and create this series of Ultimate Math Contest Preparation, Problem Solving, and Math IQ Puzzles workbooks. Ho Math Chess worksheets not only will raise students' marks; our worksheets also improve students' brain power. This is achieved through our proprietary and copyrighted Frankho ChessDoku, Frankho ChessMazes, and various puzzles. We have come a long way to reach today's progress; it has been hard work for our worksheets research team. We did not know how to answer when our students started to ask us when we will take some time off. We were very moved when our students requested to do our worksheets -- "Can I work on the worksheets which move numbers around?" Ho Math Chess has shown its marketing strength by its teaching philosophy - fun math and is backed up by its substance that is our unique and world first math, chess, and puzzles integrated math worksheets.

In the process of producing this grade 4 and 5 workbooks, I noticed that integers operations and algebraic equation have been taught to grade 4 students in China. It is debatable if algebra should be taught so early especially in North America when so many students are struggling with basic computations at grade 4, but since this workbook is also aiming to sell in China and Asian countries, so we bring this to meet to the highest international standard. The students using this workbook could be trained to participate the international math contests, not just a local or any national math contest. Teachers or parents could decide if they want to teach algebra as an option, it is up to you. How were the Chinese classic model problems written? 中国古算题是如何㝍的?Chinese classic word problems are classified according to their models.

Around the 4th century, Chinese (孙子算经) was fascinated by the discoveries of various linear models, but these models were not documented from the modern algebra's viewpoint. Today, we learn to appreciate why those class model problems were passed on from generations to generations and even were taught in some of the Chinese math textbooks. These classic model problems present opportunities for students to do the enriched math and learn difficult techniques on how to solve advanced word problems. They provide an opportunity to separate the wheat from the chaff.