Question 179390
Wow! I haven't heard that term for many years.
The "characteristic" of a log is the whole number
part of the log. The decimal part is called the 
mantissa.  Don't ask me why.
----------------------
5)1.00 
Since the number is greater than 0 and less than 10 the characteristic is 0
----------------------
6)2520 
Since the number is greater than 1000 and less than 10000 the char. is 3
---------------- 
7)2.7
Same as problem #5; answer is 0
---------------------------------  
8)0.0045
Answer is -3
==================
Cheers,
Stan H.