This book is a sequel to MATHEMATICAL CHALLENGES, which was published in 1965. In this sequel are 100 problems, together with their printed solutions. The problems range from those that are quite simple to those that will challenge even the most ardent problem solver, and they include examples from algebra, geometry, number theory, probability, and trigonometry. They are directed to students at the junior and senior high school levels, and with few exceptions they are taken from the pages of the MATHEMATICS STUDENT JOURNAL (recently renamed the MATHEMATICS STUDENT), a periodical publication of the National Council of Teachers of Mathematics. (JP)