Martha the Mathemagician and the Medieval Castle

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.

Martha Matematicianul locuieste pe Insula Calculului (unde numarul creste pe copaci) impreuna cu cel mai bun prieten al ei de o viata, Oscar Bufnita si cu bunicul ei Max, care este un matematician batran si intelept. In aceasta a doua carte a seriei, Martha isi foloseste pentru prima data calculatorul magic.