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Message: <blockquote data-quote="trk" data-source="post: 12809789" data-attributes="member: 92725">the oct 31 = dec 25 joke is a weird mathematical joke.oct = octaldec = decimaloctal has base 8 and decimal has base 10. so 31 can be written like this in octal (3 x 8 + 1) = (2 x 10 +5) = 25 in decimal. i don't know if this explains well.i don't even know much about these bases things. simply,if you wanna write 31 in octal.easiest way is seperate the two digits like (3     1) and then multiply the 1st digit (eg: number 3 of 31) by 8 (because octa means 8 and it has base 8) and add + the other digit (eg: number 1 of 31) and you get something like this [3 x 8 + 1] this equals 2525 in decimal can be written in the same way but the base is 10. [2 x 10 + 5]basically 31 in octal equals to 25 in decimal. so OCT 31 = DEC 25</blockquote>

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