To convert from between Fahrenheit and Celsius you need to know the formula which are

F = (9/5)*C + 32
C = 5/9( F - 32)
I find the easiest way to remember these is to remember that 32°F is 0° C, so the +32 goes with the conversion from Celsius to Fahrenheit.

Once you know the formulas simply enter the values and solve.

Example 1
Convert 12° C to F.

In this case we will use the first formula.
Multiply 12 by 9/5 and then add 32
9/5*12 + 32
21 3/5 + 32 = 53 3/5 or 53.6° F.

Example 2
Convert 100° C to F.

In this case use the second formula.
Subtract 32 from 100 and then multiply by 5/9.
5/9(100-32)
5/9(68) = 37 7/9 = 37.777....

Practice Problems:

1. Convert 100°F to C.
2. Convert 0°F to C.
3. Convert 50°F to C.
4. Convert 70°F to C.
5. Convert 82°F to C.
6. Convert 212°F to C.
7. Convert -10°F to C.
8. Convert 32°F to C.
9. Convert 110°F to C.
10. Convert 102°F to C.
11. Convert 100°C to F.
12. Convert 0°C to F.
13. Convert 50°C to F.
14. Convert 70°C to F.
15. Convert 82°C to F.
16. Convert 212°C to F.
17. Convert -10°C to F.
18. Convert 32°C to F.
19. Convert 110°C to F.
20. Convert 102°C to F.