What is the hexadecimal expansion of DEF16 IF416 You must do

What is the hexadecimal expansion of (DEF)_16^+ (IF4)_16? (You must do the sum in base 16, NOT base 10.)

Solution

DEF + 1F4

F + 4 = 13.

E + F + 1 = 1E.

D + 1 + 1 = F.

Therefore, DEF + 1F4 = FE3.