Beloved character Flat Stanley is back with a whole new set of friends in this STEM-focused chapter book series. In the third book, Stanley must calculate the perfect number of treats to bring to Classroom 2E's hundredth day of school celebration.

Ever since Stanley Lambchop was flattened by a bulletin board, each day brings new adventures!

It's the hundredth day of school, and the second graders in Classroom 2E will each be bringing in one hundred of something to celebrate. Stanley knows exactly what he wants to bring--flat pancakes. But the number of people coming to the party keeps changing!

Stanley must add, subtract, and multiply his way to the perfect treat for the Hundredth Day of School bash. Will he get the numbers right?

Featuring adorable black & white illustrations, an accessible approach to STEM topics, and a fun recipe for readers to try themselves. Don't miss any of Flat Stanley's classroom adventures!