“The beginning numbers of a book”s ISBN are a prefix which acts as a code for its country of origin or the language in which it is written. The country code prefix can be anywhere from 1 to 5 digits long. Examples include 0 or 1 for Englishspeaking countries, 2 for French speaking countries, 4 [...]
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“There is an interesting pattern with the fractions of sevenths (1/7th, 2/7th, 3/7th, 4/7th, 5/7th, 6/7th.). First, there are only 6 digits that are used in these fractions, and they repeat. So, for example, 1/7th is equal to .142857142857142857….(it keeps going). but here”s the cool part – to get 2/7th, you just find the next [...]
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