Sneak some mathematical learning into pumpkin picking and carving time. Have your child weigh the pumpkin she selects and measure its height, width and circumference. If you're saving the seeds to roast them, you can have your child estimate the total number of seeds in the pumpkin based on the number of seeds in one handful of goop. You can also have your child name the geometric shapes she includes as part of the jack-o'-lantern's face.