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Martha the Mathemagician and the Medieval Castle
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Martha the Mathemagician lives on Calculation Island (where numbers grow on trees) with her life-long best friend Oscar the Owl and her grandfather Max, who is an old and wise mathemagician. In this second book of the series, Martha uses her magic calculator for the first time. She and Oscar are transported to a dramatic argument between Knights about who will save the Princess from the dragon. Again she meets the Halving Ladybird to solve the problem she faces. Oh, and empowers the Princes...