Well, honey, 9 times 87 is 783. Simple math, no need to make a big fuss about it. Just multiply those numbers together and you'll have your answer faster than you can say "Betty White is a national treasure."
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C = ( 5/9) x (F - 32) = (5/9) x (87 - 32) = ( 5/9) x 55 Fahrenheit
Take any multiple of 87, and you get a number that is divisible by 87 - for example:87 x 0 87 x 1 87 x 2 87 x 3 ... 87 x (-1) 87 x (-2) ...
87 Fahrenheit = 30.56 Celsius Celsius = (Fahrenheit - 32) x 5/9 = (87-32) x 5/9 = 30.56 degrees Celsius
1 x 87, 3 x 29, 29 x 3, 87 x 1 = 87
only 83 and 89 81 = 9 x 9 85 = 5 x 17 87 = 3 x 29