This is super convoluted to some people, but its the easiest way for my weird American brain to convert it on the fly:

1. 2*°C=ans~1~
2. ans~1~—(0.1*ans~1~)=ans~2~
3. ans~2~—32=°F

The conversion most sources give you is:

(9/5)*°C—32=°F

But I find it easier to break it down into those 3 simple steps. If you’re the kind of person who calculates 20% of X in two steps [20%*X=(0.1X)*2], you might also like my weird method of converting °C to °F.