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Well welcome back this is the appendix on the hexadecimal number system first of all let's talk about why we would need to use yet another number system the hexadecimal number system humans would have been using the decimal number system for a long long time and now we have computers that use the binary number system one more number system and it's used to help us represent the numbers that are internally represented as binary so if you look at this binary number with all these ones and zeros this is not something that you would want to write down and try and figure out what this means you wouldn't call someone up and read this number to them on the phone they couldn't possibly write it down so we need a more human way of representing these binary numbers and it'll come clear to you why we've chosen the hexadecimal number system because of the conversion between binary and hexadecimal so the computers are working in binary and we need an easier way to look at these binary numbers a more human way that's why we've chosen the hexadecimal number system well hexadecimal or sometimes we'll just call this hex is base 16 in the previous pendeks we compared base 10 the decimal number system that we've been using all our lives and base 2 or the binary number system in base 16 or the hex number system we have 16 symbols to work with similarly in decimal we had 10 symbols and in base 2 we had 2 symbols so there aren't 16 different digits that we can use as symbols in the in the hex number system so we borrowed letters and we're going to use the letters A through F to represent the values 10...