Discovery Concepts: 123's by Katie Wilson, Using the Montessori method to learning, little ones can practice counting one to ten with the use of sandpaper dots and an increasing number of whimsical sea creatures. Filled with colorful illustrations, sturdy board pages, and no moveable parts make this a unique way to make learning fun! Hardcover, 20 pages. Recommended for ages 4 to 8 years old.