There are several resources to help demonstrate the correct order of operations in a calculation.
CIMT – Interactive Tutorial – Order of Operations
From the always reliable CIMT, one of their interactive sections gives examples and exercises.
You can always check answers on WolframAlpha!
WolframAlpha launched Fun Facts on Twitter in 2010, and published fun facts until 2016. Note that you can read these facts even if you are not a Twitter user.
WolframAlpha has written on this in their own blog.
On the subject of Mathematics Fn Facts – a reminder of these sites mentioned in earlier posts.
Tanya Khovanova’s Number Gossip