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How Rectangly! is the eleventh episode of Season 7 of Numberblocks, and the 101st episode overall.


Twenty-One helps some new friends find out how many rectangles they can make. Learn about the numbers 23 and 24.


The episode starts with 21-24 working out at Ten's Place. After their workout, Twenty-Four wonders if they'll ever figure themselves out. Twenty-One decides to help them out.

They go to the Rectangle Retreat where Twelve is doing yoga. Twenty-One states that figuring out what types of rectangles a number can make can make them easier to figure themselves out. After asking if Twelve if they can help the two compound Numberblocks figure themselves out, Twelve and Eighteen soon agree to help them out.

The two compound Numberblocks start figuring out what rectangles they can make, starting with their prime positions (one block wide by their number tall, and one block tall by their number wide). Twenty-Four manages to make eight rectangles (1x24, 2x12, 3x8, 4x6, 6x4, 8x3, 12x2, and 24x1), while Twenty-Three only manages to make two; 1x23 and 23x1, their prime positions. Twenty-Four proceeds to figure herself out, becoming a super-duper rectangle. Meanwhile, Twenty-Three figures himself out, affirming that he is a prime number.



  • This episode marks Twenty-One and Twenty-Two's first appearances in the 2020's decade, as well as the official figured out debuts of both Twenty-Three and Twenty-Four.
    • Twenty-Two is now no longer considered a one-time character thanks to this episode. He also has a tiny modification in design as of this episode.
  • This is the first episode where a bigger number gets figured out before a smaller one in the same episode.
  • This is the 9th time 1 is absent and the 5th time 2 is absent.
    • This is also the first episode where 3-9, 13-17, 19-20 are absent.
    • This is also the first episode where all square numbers are absent.
  • This is the first time Ten is the smallest number in an episode.
  • The two Twelves that Twenty-Four splits into saying "all day, and all night too" is a reference to the 24-hour solar day.



@Numberblocks - Full Episodes - S5 EP11- How Rectangly