Need Celsius Help: - 15 Degrees!

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I have a correspondent in Russia who says it's minus 15 degrees Celsius there today.

She has limited English and uses a Google translator to read most English.

How cold is that in Fahrenheit (sp?) degrees? Sounds very cold, certainly well below freezing. It's about 55 degrees above freezing here now.

I have a Celsius vs. F converter card, but can't find it.

Thanks.
 
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I have that formula on a note card.

Celcius degrees x 9 = Y
Y/5 = Z
Z + 32 = Fahrenheit equivalent

Therefore, it is 5 degrees Fahrenheit.
 
Minus 15 C is 5 F. Zero C is 32 F and 100 C is 212 F, water's freezing and boiling points. To get the 5 degree number I Google -15 C = ? F.
 
If you want to go the other way,

Fahrenheit degrees - 32 = Y
Y x 5 = Z
Z/9 = Celcius equivalent
 
To do it without paper, I double the Celsius number and then reduce it by 10%, then add or subtract that from 32 as appropriate.

So if it's 20C out, that's 40-4+36. 36+32=68F. Or in this case, for -15C, -15 x2= -30 then subtract 3 for -27. 32-27=5F
 
Easy way to remember is 10 degrees celsius = 18 degrees fahrenheit
10C =50F
20C= 68F, and so on
here's a quick question 15C = what???? that's right campers 15C = 59 degrees cause if 10 =18 than 5 = 9
In my dottering oldedge I have determined that henceforth (actually about a year ago) that I would use celsius in my temperature calculations and have so recalibrated the thingy in old blue's rear view mirror. Main reason is that it irritates my wife and oldest daughter. Because blue doesn't have the fancy computer, I cant change the speedo to km, nor can I change the display to French so until I get a newer version I am stuck with mph and Anglais. But not with daughter's suburbam :D

I've gotten pretty fluent in celsius as long as it's above freezing but since it doesn't get below 32 much down here it takes a bit longer to do the calculation when it's below freezing.
I know that 16-23 is my comfort range-when it hits 30 it's toasty outside and anything above that-HOT
 
I can't get those formulas to work on my calculator. But I failed algebra. The teacher was a basketball coach who seldom stayed in the classroom and was a sarcastic, unhelpful jerk when present. My parents were no help. My father took algebra, but we were estranged and my parents divorced. I've hated math ever since. Never needed more than basic aritihmetic until now.

Thanks for the answers. I guess I'd better find my card or write down a simple conversion formula.
 
I think my quick & dirty method only works when the temp is above zero Celsius,
but I've always done, x's 2 + 30 Celsius and it gets me real close.

So, if it was 20 C, x's 2 = 40 + 30 gives me 70 F......

I've spent well over a year of my life in Canada and that method has
always served my needs, when trying to make sense of temp forecasts.
 
Living in Australia, the old diggers I hung out with had lived through the "change" from Kings to metric, they just doubled it and added 32. Close enough. They still referred to a dollar as a quid.
 
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