What is in the mysterious old box that Molly and Michael find? They are helped to solve the puzzle by Grandpa Bert who lives in his own world of science and brain-teasers. Enjoy their adventure as they solve riddles and discover how tricky and clever numbers can be.
All children know that they are smarter than their parents. Funnily, by the time they have become parents they will have forgotten this. If parents have any difficulty with the numbers in this book, their 9-12 year olds who read it will be able to give them an explanation.
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