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# 256 Examples of Hexadecimal Numbers

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Hexadecimal numbers are numbers that are based on 16 digits. This can be contrasted with regular decimal numbers that use the 10 digits -- 0, 1, 2, 3, 4, 5, 6, 7, 8, 9. The additional numbers in hexadecimal are represented with the first letters of the alphabet A,B,C,D,E,F. This is easy enough. The trick with hexadecimal numbers is that they are base 16. For example, 10 in hexadecimal is 16 because the 1 is 1x16 instead of 1x10 as in decimal. This can be difficult to get your head around. The following examples may help.
 Decimal Hexadecimal 0 0 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 10 A 11 B 12 C 13 D 14 E 15 F 16 10 17 11 18 12 19 13 20 14 21 15 22 16 23 17 24 18 25 19 26 1A 27 1B 28 1C 29 1D 30 1E 31 1F 32 20 33 21 34 22 35 23 36 24 37 25 38 26 39 27 40 28 41 29 42 2A 43 2B 44 2C 45 2D 46 2E 47 2F 48 30 49 31 50 32 51 33 52 34 53 35 54 36 55 37 56 38 57 39 58 3A 59 3B 60 3C 61 3D 62 3E 63 3F 64 40 65 41 66 42 67 43 68 44 69 45 70 46 71 47 72 48 73 49 74 4A 75 4B 76 4C 77 4D 78 4E 79 4F 80 50 81 51 82 52 83 53 84 54 85 55 86 56 87 57 88 58 89 59 90 5A 91 5B 92 5C 93 5D 94 5E 95 5F 96 60 97 61 98 62 99 63 100 64 101 65 102 66 103 67 104 68 105 69 106 6A 107 6B 108 6C 109 6D 110 6E 111 6F 112 70 113 71 114 72 115 73 116 74 117 75 118 76 119 77 120 78 121 79 122 7A 123 7B 124 7C 125 7D 126 7E 127 7F 128 80 129 81 130 82 131 83 132 84 133 85 134 86 135 87 136 88 137 89 138 8A 139 8B 140 8C 141 8D 142 8E 143 8F 144 90 145 91 146 92 147 93 148 94 149 95 150 96 151 97 152 98 153 99 154 9A 155 9B 156 9C 157 9D 158 9E 159 9F 160 A0 161 A1 162 A2 163 A3 164 A4 165 A5 166 A6 167 A7 168 A8 169 A9 170 AA 171 AB 172 AC 173 AD 174 AE 175 AF 176 B0 177 B1 178 B2 179 B3 180 B4 181 B5 182 B6 183 B7 184 B8 185 B9 186 BA 187 BB 188 BC 189 BD 190 BE 191 BF 192 C0 193 C1 194 C2 195 C3 196 C4 197 C5 198 C6 199 C7 200 C8 201 C9 202 CA 203 CB 204 CC 205 CD 206 CE 207 CF 208 D0 209 D1 210 D2 211 D3 212 D4 213 D5 214 D6 215 D7 216 D8 217 D9 218 DA 219 DB 220 DC 221 DD 222 DE 223 DF 224 E0 225 E1 226 E2 227 E3 228 E4 229 E5 230 E6 231 E7 232 E8 233 E9 234 EA 235 EB 236 EC 237 ED 238 EE 239 EF 240 F0 241 F1 242 F2 243 F3 244 F4 245 F5 246 F6 247 F7 248 F8 249 F9 250 FA 251 FB 252 FC 253 FD 254 FE 255 FF
As an example, FD is (15×16) + 13 = 253. The F is worth 15 but is multiplied by 16 because it's in the second position. The D is worth 13 but isn't multiplied because it's in the first position.
The alphabetic characters in hexadecimal are traditionally represented with uppercase letters. This feels a little loud such that it is common in some domains to use lowercase letters. For example, an html color code such as #ffffff.

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