**
**

Double the Celsius temperature *minus*
(1/10 of that result) + 32

Boiling point of water = 100°C

**2x100=200-20=180 + 32=
212°F**

**(Google
it)**

**What's the freezing
point of water??**

**0°C**

0°C x 2 = 0 + 32 = 32°F

**(Google
it) **

**
Forty below ***is*
forty below

-40°C x2= -80 - -8 (+8) = -72 +32 = -40°F

I'll let you Google that one yourself.

If you Google
Celsius Fahrenheit Conversion, just about all use the formula

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

**Well, this
is a more User Friendly form of the 9/5**

**9/5 = 1.8**

**I use 2
(doubling) minus 10% or .2**

**2 - .2 = 1.8
Whoa! it's the same formula. Just a LOT easier to
use.**