by 
Farino
ANSWERS: 1
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You can write fractions in the duodecimal system, using T and E for the extra two "digits", in a similar way to how it is done in decimal. As fractions: T/E (in duodecimal) is 10/11 (in decimal) You can also use a decimal (or duodecimal) point. One third cannot be written exactly as a decimal: it is approximately 0.333 But in duodecimal, one third is exactly 0.4 Here the four after the point stands for four twelfths instead of four tenths. Similarly, while one fifth is exactly 0.2 in decimal, in duodecimal it cannot be represented exactly this way, but is approximately: 0.24972497... which stands for 0 + 2 * 12^-1 + 4 * 12^-2 + 9 * 12^-3 + ... (you get the digits by repeatedly multiplying the remaining fractional part by twelve: 12 * 1/5 = *2* and 2/5 12 * 2/5 = *4* and 4/5 12 * 4/5 = *9* and 8/5 etc)
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