Hex is easy to learn
numbers go from 0-F. Think of A,B,C,etc as 10,11,12,etc.
0xBEEF
Start from the right. The last digit is your ones, then the next to the last is your 16s, then your 16^2s, 16^3s, etc. For this example, it is F*1 + E*16 + E*16^2 + B*16^3.
Translating the letters, you get 15 + 14*16 + 14*16^2 + 11*16^3. The answer is 48879.