Being able to calculate correctly and efficiently is one of the most basic but important math skills. Therefore, it is not surprising to see various calculation problems in competitions at all levels.This book focuses on calculation skills. Contents are grouped by lectures. Each lecture features a classic problem. Many of such problems are not too hard to solve. However understanding how to solve these problems is just the very first step. It is more important to understand and master relevant calculation techniques. These techniques can help solve various problems of similar nature that will for sure appear in future math competitions.Readers should have basic algebraic knowledge and skills in order to appreciate the contents in this book. Some problems involve trigonometry and complex number. They can be safely skipped by those readers who are not familiar with these two subjects. Skipping certain topics will not affect learning other techniques contained in this book.Levels: MathCounts / AMC 8 - AMC 12 Table of contents, pre-assessment and more information can be found at
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