Hexadecimal is easy...
A simple explanation:
Our number system "decimal" is base 10. This means that we have 10 digits. 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.
Once we hit 9, we put a 1 infront, and start again..10, 11, 12..
Then a 2 infront etc etc.
Hexadecimal (meaning Base 6-hex + 10-dec), is base 16.
It is 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F.
Meaning that Hexadecimal A = Decimal 10, Hexadecimal F = Decimal 15 etc
Once you get to F, the system works the same. You tack a 1 infront of it.
10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 1A, 1B, 1C, 1D, 1E, 1F...
Then a 2, etc etc....
If you consider that really there are always an infinite number of 0's before any number (eg. 000001=1) then its easy to remember you just add 1 to the furthest right column. If its F, you take it back to teh start, and add 1 to the next etc etc.
So basically...
You get
Decimal:Hexadecimal
0:0
1:1
2:2
3:3
4:4
5:5
6:6
7:7
8:8
9:9
10:A
11:B
12:C
13: D
14:E
15:F
16:10
17:11
18:12
19:13
20:14
21:15
22:16
23:17
24:18
25:19
26:1A
etc etc..
If you use the scientific calculator in windows, u can convert to decimal from hexadecimal