Yan Kow Cheong is a maths coach, writer and editor. A mathematics consultant for "MathPlus Consultancy", he specialises in both adult and recreational maths education. He conducts recreational and competition maths courses and workshops for schools and enrichment centres, 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" 12-book series; "Challenging Word Problems (Common Core Edition)" six-book series; Mathematical Quickies & Trickies; Geometrical Quickies & Trickies; Aha! Math; CHRISTmaths: A Creative Problem Solving Math Book. (For a sample of his published books, please visit: amazon.com/author/yankowcheong) His academic interests involve research in maths education, in particular, the psychology of learning and teaching mathematics, and creative problem solving. He is a life member of both the Singapore Mathematical Society (SMS) and the Association of Mathematics Educators (AME). He is also a member of The Association of Christians in the Mathematical Sciences (ACMS). For information about the author, click https: //sites.google.com/site/mryankowcheongssite/