this post was submitted on 22 Aug 2023
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The quick conversation I use is take off 30 and half the rest to go F to C or double it and add 30 to go C to F.
20C doubled is 40 and add 30. 70F
80F take off 30 is 50. Half that is 25. 25C
It's not completely accurate but close enough for conversation purposes.
I use that trick too! I just wanted to make sure I got it correct as a service