Skip counting fun! Join Buster and Lass and their new sea horse friends for a special undersea counting adventure. It's a fun and different way to learn number skills. Instead of focusing on simple 1-2-3 skills, this book focuses on number sequencing and grouping by 2s and 3s. The ability to see groups of items and know their count is an essential skill for your child's development and forms the basis of many more advanced number skills.