It's Time for Counting (1998)

Stella the Storyteller comes in to show Barney and the kids a surprise and brings a special clock to know when it's time to show it. However, she finds that most of the numbers are missing, leaving only the 4 and the 5. So Barney and his friends must find the rest of the numbers. Their search takes them to the library, where they read classic stories and learn about counting, working together and sharing with others.