Instructions are given for the 11th, 12th, and 13th Editions.

Temperature:
11th Edition, Sec.2.11, p30-32
12th Edition, Sec. 2.8, p33-35
13th Edition, Sec. 2.8, p31-34

Read what the book says about temperature and the three scales used for temperature. Learn how to convert between the three scales. Notice that the book gives you names of the three scales, (Fahrenheit, Celsius, & Kelvin) but does not explain how these names came about or the how the temperature scales were created. I feel that if you don't know this background information, there will always be a hole in your learning. I cover temperature in a separate tutorial, but if I didn't, you should do your own background check.

Density:

11th Edition, page 35:
12th Edition, page 37
13th Edtion, page 34-37
Density is useful for many aspects of chemistry. It helps you identify unknown substances. It tells you whether a poisonous gas will rise or sink which helps you pick the right way to escape. It helps you purify mixtures and do many more things.

Density can be calculated with simple measurements-volume and mass.

Read Section on Density

The book shows both the algebraic approach and the Dimensional Analysis approach. Trust me, the Dimensional Analysis will be easier in the long run, so focus on that approach.