My First LeapPad: Pre-Math - "Tad's Silly Number Farm" Interactive Book and Cartridge by LeapFrog Toys. $9.63. Tad puts on his overalls for some counting fun on the farm. On the activity side of the book, your child can grab a pitchfork to feed the horses, milk the cows and count the chickens alongside Tad. Preschoolers just place the flip book on the My First LeapPad player, pop in the cartridge, and touch any page with the Magic Pen to bring learning to life.