Here you are.. start from right (we know that hexadecimal means a number to the base of 16)so the first term into 1, 2nd term into 16, 3rd term into 16*16, 4th term into 16*16*16 and so on... and add them.Remember A stands for 10, B for 11, C for 12, D for 13,E for 14,F for 15. that's all now it is very easy lets take E78 as an example ***from right :8*1=8 7*16=112 E(14)*16*16 =3584 Now add them 8+112+3584=3704