I bought these so that my son can practice elementary school math olympiad problems (he is in 4th grade). This book has 80 olympiads, 5 problems each for a total of 400 problems. In the back of the book there is a section with hints for each problem. This section does not tell you how to solve the problem, but gives one or two suggestions to get you pointed in the right direction. Following this is a section with actual solutions (in case hints did not work and also so that you can check the answers). The solution section not only gives the answer, but also explains how to solve the problem.
This book does not correspond to any particular grade level, so some of the problems may require knowledge that your child has not yet covered in school, so in those cases you may have to explain the concept first (e.g. what is an average).
This book is good for children who want extra practice to prepare for math olympiad or just for children who find regular math curriculum easy or boring and need an extra challenge. It is not, however, a substitute for regular math instruction.
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