OK, so I never did like the 9/5c in any formula. So here is one well conversion formula worth writing down.

Convert degrees C to degrees F:

1. degrees C x 2
2. minus the first digit
3. add 32

Example:
25 degrees C = ___ degrees F
25 x 2 = 50
50 – 5 = 45
45 + 32 = 77 degrees F

Now, to go from degrees F to degrees C

1. degrees f – 32/2

Example
88 degrees F = ____ degrees C
88 – 32 = 56
56/2 = 31 degrees C

Yes? No? Maybe?