Ep 21. Twenty-one and On

Numberblocks Season 4 Episode 21, named "Twenty-one and On," revolves around the number 21 and its various forms. The episode starts with the introduction of the number 21 as a duo of 10 and 11, who team up to perform extraordinary feats. The number 21's unique shape and mathematical properties are explored throughout the episode, with the numberblocks getting creative with the various ways in which 21 can be represented.

The episode features a catchy song that explains the different combinations that make up 21, such as 5+16, 8+13, and 3+18. The numberblocks also demonstrate how 21 can be used to count in groups of 3, 7, and 21 itself. As the episode progresses, the numberblocks show how 21 can be broken down and rearranged in different ways to make new numbers.

The numberblocks also discover that 21 is a composite number, meaning that it can be divided by other numbers besides 1 and itself. This leads to a discussion about prime numbers and how they differ from composite numbers. The numberblocks demonstrate how 21 can be broken down into its various factors, which helps them understand the concept of factoring.

As the episode nears its end, the numberblocks explore the different ways in which 21 can be used in everyday life, such as in sports, cooking, and music. Along the way, they learn about the significance of the number 21 in various cultures and traditions.

Overall, Numberblocks Season 4 Episode 21 is an informative and entertaining exploration of the number 21 and its many forms. The episode highlights the importance of mathematics in everyday life and encourages viewers to think creatively about numbers and their properties. Through catchy songs and engaging animations, the numberblocks make math fun and accessible for children of all ages.