Converting denary to hexidecimal

Question 1

How is hexadecimal measured

Answer 1

using the graph
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

Question 2

How are the top numbers set up

Answer 2

You split the numbers into 4s (nibble)

128 64 32 16 8 4 2 1

Then each one is set as 8 4 2 1

8 4 2 1 8 4 2 1

Once it is set up, then you use each binary number in its own nibble
Each nibblecreates 15

Question 3

what is 255 in hexadecimal

Answer 3

FF