"Five hundred thousand"
It does not allow a discription of what to report, so I will do it here in hopes a moderator looks at it: Laki has not been taught yet, but my girlfriend (Kenyan) says it is true; I think they should bring this up or add the option of using "elfu mia tano."
I think we have seen on numerous occasions that the teaching philosophy in this course differs from what you expect. They don't intend to always "teach" a concept before introducing it in the rote-like exercises. There are certain things they deliberately choose to "teach" by introducing them in contexts which will of themselves lead us to grasp the meaning and thereby learn .