2 ms·
The equation is "F = C * 9 / 5 + 32", and reversed, "C = (F - 32) * 5 / 9" If you're just quickly doing it in your head, "F = C * 2 + 30" and "C = (F - 30) / 2
by Izkata 2y ago
The equation is "F = C * 9 / 5 + 32", and reversed, "C = (F - 32) * 5 / 9"
If you're just quickly doing it in your head, "F = C * 2 + 30" and "C = (F - 30) / 2" are pretty close.
- moi2388 2y agoYes, but even better would be: fahrenheit to celcius: ((F-32)/2)+10% So: 100F = 100-32=68/2=34+3.4=37.4 (actual 37.7) 32F = 0/2=0 50F = 50-32=18/2=9+10%=9.9 (actual 10) I prefer this heuristic, since after taking the 32 difference, it’s just halving and adding 10%, which is very easily and quickly done mentally (as compared to (5/9)