I have found several websites that might help you with this concept.
Purple Math has a great site that shows examples here.
Check out the Unusual Outcomes in this PDF file. The other information there is also very good. The explanations are detailed.
Use this PDF file to help you determine when to add and when to multiply and then add.
Here are some problems that you can try to determine if you are getting it. Their answers are provided as well.
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