Pumpkin Math (with free Pumpkin Worksheets) - Little Bins for Little Hands Printable Pumpkin Math Worksheets MATH ACTIVITY 1: CIRCUMFERENCE OF PUMPKIN Use a piece of string to find the circumference or distance around your pumpkin. Make sure to predict the measurement first! First, my son used the string to measure around the pumpkin and then he laid it out again a yard stick.