system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are the words "eleven" and "twelve," so different from the pattern of thirteen, fourteen, fifteen, etc?
gpt
Those two words came from Germanic words meaning "one left" and "two left", referring to how many things are left over after ten have gone.

The -teens come from -ten. For example, thirteen was three-ten, fourteen was four-ten, etc.