Why are 18 and 19 expressed as something less than 20, while 11 - 17 are expressed as something more than 10? Why are only 18 and 19 chosen to be expressed that way?
Are 8 and 9 expressed as something less than 10? If not, why not?
What does -de- mean in 18 and 19? Does it mean "less than"?
Why are 21-27 expressed using et, unlike 11 - 17?
Thanks.
