While learning to count, all children will skip numbers. The opening dialogue illustrates this process: "1, 2, 3, 5." "Where's 4?" "4 went on vacation." With 4 missing, 1, 2, 3, and 5 all speculate as to where 4 is vacationing and what 4 is doing on his vacation. These fantasies range from going to the moon, swimming to the bottom of the Marianas Trench, and running in the Olympics. After 4 returns, 4 tells them all about his camping trip to 4 Rainbow National Park. 4 and his family went hiking, swimming, canoeing, and bicycling before coming home to Numberland. The book's narration is...

While learning to count, all children will skip numbers. This is the second book in a series where a number is skipped while counting. Four Went on Vacation is the first book in this series. 8 has one especially exhausting day. By the time he falls asleep, 8 is so tired that he sleeps for 4 days. The narration of the book is about the adventures his friends, 5, 6, 7, and 9, have while 8 is sleeping. 5, 6, 7, and 9 go to the park, have a picnic at the lake, go fishing, go to the movies, have pizza, go the beach, and the Kids Rock concert. 8 is not happy when he finally wakes up. The book's...