Math Mysteries: The Fall Festival Fiasco

Can you crack the case before the Prime Detectives do?
Autumn has arrived and the fourth graders at Arthimos Elementary couldn't be more excited for the Fall Festival! But when the tickets go missing, the pie eating contest is sabotaged, and a suspiciously humongous pumpkin shows up, will anyone be able to save the day and catch the culprit?

The school's best (and only) investigators are on the case: The Prime Detectives--Abby "the Abacus" Feldstein, Cameron "Cam" McGill, and Gabriel "Gabe" Kim. Using arithmetic, geometry, and logic, these amateur detectives will stop at nothing to figure out who did what, when, and why! Math Mysteries: The Fall Festival Fiasco by Aaron Starmer is a page-turning whodunit brimming with lighthearted intrigue and essential middle-grade math skills. Perfect for mystery and math lovers alike, as well as kids who love puzzles, riddles, brainteasers, and adventure stories! Contains multiple, interlinked mysteries that readers help solve using math. Includes answers showing step-by-step solutions. Also from the MATH MYSTERIES series:
The Triplet Threat