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"You can't just sing any old thing!"S
This episode contains a song and its page has its lyrics. If you know how it goes, you can sing along!
Note: the lyrics are sometimes on the transcript to prevent browser crashes.

Just Add One is the twenty-first episode of the series and overall the sixth episode of Series 2.


One's idea of fun is singing, dancing and making friends by adding One.


  • Song: Just Add One
  • The Numberblocks' ideas of fun in the song:
    1. Being one
    2. A song and dance
    3. Juggling things
    4. Being square
    5. High fives
    6. Playing games
    7. Making rainbows
    8. Being Octoblock
    9. Not sneezing
    10. Being ten
  • 8 is the only Numberblock who has no vertical arrangement in this episode.
  • This episode was mentioned in More to Explore.
  • The song lyrics and images for this episode appear in pages 6-9 of the Cbeebies Special Magazine Issue 104. However it has some changes:
    • The intro line before 1 appears is not sung.
    • 4 doesn't sing "Ouch, ouch, ouch, ouch, 4 corners." He sings "1, 2, 3, 4, 4 corners."
    • 5 doesn't sing "If you add another one / The number gets one bigger / And if you keep on adding one / You can get to any figure."
    • 9 doesn't sneeze.
  • When 5 arranges herself into 1+2+2, she has her design from "Hide and Seek", in other episodes, Her face is on her top block. Seven and Nine follow this change too.
  • The instrumental version of the song can be heard on the menu of the game Numberblocks Make & Play and Numberblocks: Hide and Seek.