21 What do I do with this improper fraction?
8
You need to change it into a mixed fraction. How do you do this? Well, think of beer. You have 21 bottles but can only carry 8 bottles at a time...
You will make 1 full trip, carrying 8 bottles.
You will make a 2nd full trip carrying another 8 bottles.
You have 5 bottles left. They do not represent a "full" trip. Your 2 "full trips" become the whole number component of the mixed fraction. 
Your 5 bottles that are "left over" go on the top shelf of the fridge. (That is where all left overs go." Your denominator was 8, so let's keep it at 8. You now have...
2 5
8
For a video explanation, start 2 minutes into the video here
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