It's party time at The Number Tower in this hilarious new story about a group of number friends. Three is very excited about having a birthday party.But when the other Digits arrive, things don't go to plan.There isn't space for everyone to sit or enough cake to go around.Can the Digits find a way to save the party and give Three the best birthday ever?Perfect for understanding greater and less, double and half - you can count on the Digits to make numbers fun!