1.1.2 (c): convert positive hexadecimal integers to and from decimal:

e.g: convert DE3 to decimal

D = 13 E = 14 so DE3 = 110111100011

=3555

e.g: convert 200 hexadecimal

200 = 11001000

= C8 (1100=12=C) (1000=8=8)