Although there are many online temperature converters, it's always helpful to have a knowledge of the actual formula for the conversions.

C is Celsius

F is Fahrenheit **C = 5/9 ( F-32**

**F = 9/5 ( C+32 **

Let's try converting 68 degrees Fahrenheit to celsius 5/9(68-32)

Step 1: 68 less 32 is 36

Step 2: 5 divided by 9 is 0.5555555555555

Step 3: multiply the repeating decimal by 36

Step 4: your solution is 20

Now, convert 20 degrees Celsius to Fahrenheit to check your work.

9/5C +32

Step 1: 9 divided by 5 is 1.8

Step 2: 1.8 multiplied by 20 is 36

Step 3: 36 plus 32 = 68

So you need to have some strategies to make the conversion in your head?

Method 1 - C to F - *Double less 10% add 32.*

This works quite well for many people.

Consider this report - the temp today is 18 deg C. Being used to Fahrenheit you need to convert

to know what to wear outside. So double the 18 ( 2 x 18) = 36. 10 % of 36 is 3.6 - round to 4.

36 -4 = 32. 32 add 32 = 64. So I will bring a sweater but not a big coat.

Try this one in your head 29 degrees C.

Solution - 84 deg F.

29 doubled = 58.

10 % of 58 = 5.8 , round to 6.

58 - 6 = 52.

52 add 32 = 84.

So a nice warm day!

Method 2 - C to F or F to C. *Memorize your 10 blocks*.

If accuracy is not critical, memorize the 10's and work with the range.

10 = 52

20 = 68

30 =86

40 = 104

So you are told the temp is 15 C . The range is 52 to 68 and the middle is 60 F.

For weather, 20 is nice but 30 is very nice.

Wouldn't it be nice if we just had one system for measurement?!