Buried treasure! Matthew can't wait to tell his friends in the Elm Street Kids' Club about the cool map he found. It's over 50 years old and filled with clues that lead them to the new Wonderland Park. Petey the Parrot cheers them on as they try to make sense of dated directions. The clues don't always match—a dirt path has now become a paved sidewalk and there's the mystery of what happened to the big old tree. But they finally find the "X" that marks the spot and start digging.

It's a time capsule! The kids decide to add their own treasures to surprise the next group of friends that finds the map. Even Petey contributes a loose tail feather.

Map-reading uses several mathematical skills, including interpreting symbols and understanding scale and direction

MathStart is an award-winning series by Stuart J. Murphy that teaches math through stories and visual models. Young readers find the stories engaging and relatable, because each story revolves around practical applications of the math concept being presented and features lively art from top-notch illustrators.

Charts and other visual representations help children understand how the math works and promote deeper comprehension. This unique combination of stories, illustrations, and visual models helps teachers and parents in the teaching of math and provides all children with the opportunity to succeed.

The 63-book series is divided into three levels with 21 books in each. The math concepts taught in MathStart books conform to state and national standards. Level 1 is Pre-K–Kindergarten; Level 2 is Grades 1–3; Level 3 is Grades 2–4. The series follows math topics across grades so there is a foundational path to learning that runs through the levels.