Yan Kow Cheong is a math coach, writer, and editor. A math consultant for "MathPlus Consultancy," he specializes in both adult and recreational math education. He conducts recreational and competition math courses and workshops for schools and enrichment centers, and educates the public against innumeracy and pseudoscience. Kow Cheong has ghostwritten and edited both local and foreign textbooks and assessment (or supplementary) titles for students, teachers, and parents. Some of his publications are: Additional Maths 360; Word Problems in Focus series; Challenging Word Problems (Common Core Ed...