[sdiy] What does it mean?

[Larry]

Hello All

Here is the silly question of the week.

I have been seeing ratings for resistors like 1k3 or 2M2.  How do you read 
these?  I'm used to100K or 10M.

I've seen similar ratings, such as 2u2 or 4n7 on capacitors.  Again, how do 
you read these?

Sorry about the level of such a newbie question, but I haven't paid much 
attention to parts lists and schematics for the last 20 years, and in the 
70's and 80's I never saw part ratings like these,

Larry