This 24 Question Order of Operations worksheet is designed to be done without the use of calculators. Its answers are mostly integers with one or two simple fractions.
This is a word document so it can be edited if you want to make it shorter to suit your own needs or change a problem or two as well as change the heading.
For high school students this is a great first week of school warm-up activity that can be done in pairs or as a review. For middle school students this could be done as a core skill activity or homework assignment.