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How to convert the base of 16 in the computer with the base of 10 in the mathematics we have learned?
Hexadecimal is every 16 to 1. In order to represent hexadecimal numbers, sixteen symbols must be defined. They are:

0-9: Same as decimal.

A: Decimal 10

B: decimal 1 1

C: decimal 12

D: decimal 13

E: decimal 14

F: decimal 15

That is to say, the maximum hexadecimal number of a number is f, decimal means 16, hexadecimal means 10, and so on.

Hexadecimal 0 1FF means that the first digit is f, the second digit is also f, and the third digit is 1, that's all.

Hexadecimal 0 1FF = decimal1* 256+16+15 = 51.