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The original Challenge Math is being used by teachers all over the country to provide additional enrichment and develop student problem solving skills. Children love the fascinating stories that tie math and science together and show real life applications for math. Over 1000 problems at three levels of difficulty to challenge even the brightest students. This second edition contains the original text and answer key but also includes an additional 80 pages of detailed step-by-step instructions for solving the problems. Includes Chapters On: Astronomy Algebra Problem Solving Percents Fractions Decimals Ratio & Proportions Physics Statistics Probability Metric System Perimeters Area Volumes Trigonometry Calculus