Sorry, I don't know how to make notes about the lessons in general, so I'll just make the note here. I think it would be a good idea to have a Numbers 1 and a Numbers 2 in the future. I really wanted to learn the number system earlier (in the first few lessons) since it's so important when trying to buy anything. You could do basic numbers in Numbers 1, then do "much," "enough," etc. in Numbers 2.
I take the opportunity here to leave feedback too. I think it would be more useful if the speakers speak more slowly in the beginning, so that each word can better be identified by the beginner. Later, at a more advanced level, the speakers can increase their speaking speed and at the end use normal conversation speed.