I generally do not use significant figures in my workbooks UNLESS it is the question pages. All the practice questions involve significant figures. Make sure you read the chapter on significant figures (print them out and have them as you do calculations if needed) and apply the rules if your instructor/marker is strict on them! Also, over time I will correct the problems included to include sig figs and include a statement saying if they are.
In this post will eventually be a site map and links to the various articles.