If you need to format numbers in excel to increase or decrease the number of decimal places then you can do that easily. It could be that you want to specify exactly how many decimal place such as two decimal places.
What I use to create these videos. Camtasia allows you to record and edit what you are doing on your computer great for training and instructional videos:
Conditional formatting allows you to automatically get Excel to change the appearance of some cells based on their values. This is particularly useful if you need something to stand out so that as you scan the worksheet you are quickly drawn to what you are looking for. Here Gary Schwartz from http://www.jargonfreehelp.com gets us started with highlight cells rules, data bars, color scales, icon sets and top-bottom rules. You will also see how to clear a rule. See part 2 for more customising of the rules.