The solution (green arrow) states that for example :
0xD + 0x9 = 0x16
Details :
0xD = 13,
0x9 = 9,
13 + 9 = 22,
22 = 0x16
Where does the 0x16 come from? I do get to add D + 9 = 13 + 19 = 22 so how come 22 is equal to 16 (assuming D + 9 = 16 is correct) How am I suppose this solution?