32°F is 0°C which is why you need the 32 in there. For the fraction I always just try to think about whether Celsius or Fahrenheit is bigger. Accordingly, I’ll need a number smaller or larger than one.
edit:
Aight I got the fraction wrong, which kinda proves that it’s useless to remember lmao.
Here’s how you convert between the two:
T[°C] = (T[°F] - 32)* 5/9
32°F is 0°C which is why you need the 32 in there. For the fraction I always just try to think about whether Celsius or Fahrenheit is bigger. Accordingly, I’ll need a number smaller or larger than one.
edit:
Aight I got the fraction wrong, which kinda proves that it’s useless to remember lmao.
That edit lol I used to know this by heart at some point in my life. Now I’m fine knowing that it exists and use software to do it for me instead