C->F ADD 40, Divide by 5, Multiply by 9, SUBTRACT 40
F->C ADD 40, Divide by 9, Multiply by 5, SUBTRACT 40
Notes: always ADD 40 first, if you *want Fahrenheit* then you want 'more' range so multiply by 9 (and divide by 5), if you *want Celsius* then you want 'less' range so divide by 9 (and multiply by 5), then SUBTRACT 40
This is much easier:
C->F ADD 40, Divide by 5, Multiply by 9, SUBTRACT 40
F->C ADD 40, Divide by 9, Multiply by 5, SUBTRACT 40
Notes: always ADD 40 first, if you *want Fahrenheit* then you want 'more' range so multiply by 9 (and divide by 5), if you *want Celsius* then you want 'less' range so divide by 9 (and multiply by 5), then SUBTRACT 40
No 32's in sight.