30 - 32 = -2
-2 divided by 9 is -0.2222222
-0.2222222 times 5 = -1.1111111
So 30⁰F = -1.1111111⁰C
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Previous response: "79 degrees Fahrenheit" Wrong! 30 C is equivalent to 86 F or 303 K. An easy way to remember C to F is that a difference of 10 C is also expressed as 18 F, so that 0 C is 32 F, 10 C is 50 F, 20 C is 68 F, 30 C is 86 F, 40 C is 104 F...100 C is 212 F. Bonus question: where is C=F? Minus 40 C = Minus 40 F.
(86 F - 32) x 5/9 = 30 C
30 degrees F because 30 degrees C is about 90 degrees F and you would not have much ice on the lake!
(-30) degrees Fahrenheit = -34.4 degrees Celsius[°C] = ([°F] − 32) × 5⁄9
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