I'm sure this is possible, but I just have no idea how to go about doing it. This is what I'm looking to have in my spreadsheet (in plain English)...
If cell C1 is between 1-5, then cell C2 should come back with a value of A.
If cell C1 is between 6-10, then cell C2 should come back with a value of B.
If cell C1 is between 11-15, then cell C2 should come back with a value of C.
If cell C1 is between 16-20, then cell C2 should come back with a value of D.
If cell C1 is between 21-25, then cell C2 should come back with a value of E.
IF/THEN is definitely a weakness of mine. Does anyone know how to do this?
Edit: also, how would I get it so that no text shows (like FALSE) if no value is in C1?
Edit 2: Wow, thank you so much for all of the responses! I really appreciate the help! I'll play with all of this later this evening.
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It's a little tricky because of the nested IFs but here is my answer (confirmed in Google Spreadsheets):
=IF(AND(A2>=0, A2<500), "Less than 500",
IF(AND(A2>=500, A2<1000), "Between 500 and 1000",
IF(AND(A2>=1000, A2<1500), "Between 1000 and 1500",
IF(AND(A2>=1500, A2<2000), "Between 1500 and 2000", "Undefined"))))
I suggest using vlookup function to get the nearest match.
Step 1
Prepare data range and name it: 'numberRange':

Select the range. Go to menu: Data → Named ranges... → define the new named range.
Step 2
Use this simple formula:
=VLOOKUP(A2,numberRange,2)

This way you can ommit errors, and easily correct the result.