Elephant is too heavy to play with Mouse on the seesaw. Their friends can help, but will it be enough to get Elephant's feet off the ground? A great deal (of Elephant) hangs in the balance in this hilarious introduction to the maths concept of weight. With engaging artwork and a very funny story, readers won't even realize that they're learning something while they laugh along with the animal friends! Features fun activities at the back to explore the topics further.