Hi all Firstly this is not a homework question. I just found myself wondering what certain numbers meant while at work and realised that i didnt actually know hence the posting. I was hoping someone could help explain & confirm a couple of things about units. 1) Given the number 4.172 meters I interpret this number at 4 whole meters And the 0.172 part I interpret as a portion of a whole meter My first question is this; is 0.172 (the fractional part) still in meters or is this in cm? 2) Assuming that 0.172 is in meter then to understand the 0.172m a little better I have done the following:- 1 ● 1 / 10 1 / 100 1 / 1000 0 ● 1 7 2 I have re-writtern this fractional part as 172/1000 My understanding at this point is that the denomniator (1000) represents my whole meter and the numerator represents the portion of the whole meter Is this correct? Attached is a PDF document where i have tried to understand more about units which i was hoping someone could look at.