Part of the popular Sir Cumference series! Baker Pia is back with a handy way of counting by tens and fractions in this fun introduction to the decimal system. This time the focus is back on Pia of Chartres from Sir Cumference and the Off-the-Charts Dessert. She is kidnapped by a family of ogres–Tentt, the father, Hoondrit, the mother, and their ten daughters, Una to Decima. Pia is asked to help the ogres prepare a feast for a large celebration, which will involve tens, hundreds, even thousands of pieces of dessert! Readers will learn about place value and the decimal system of notation in this latest medieval math adventure. The endnote includes a diagram with place names.