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A Little Trick for Converting Centigrade to Fahrenheit

A Little Trick for Converting Centigrade to Fahrenheit

Old Jan 8th, 2017, 06:51 AM
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Thanks for this! I often look up and go to a C-F conversion webpage, not easy if there's no free WiFi, or while traveling.
Really appreciate it!
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Old Mar 25th, 2017, 03:25 AM
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Thanks for this helpful trick of converting farenheit to celsius. I was born in America and moved to England when I was 9 and have lived here for 5 years yet am still getting to grips with the metric system.
My teacher once asked me how tall I thought I was and I knew at that time I was 4 and a bit feet so I told him I was 2 metres!!

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Old Mar 26th, 2017, 07:58 AM
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Livey_standish, you said you were born in America and moved to England at age 9, and you have lived there for 5 years. Are you saying you are only 14 years old? If so, you might be the youngest Fodorite ever.
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Old May 16th, 2017, 05:42 AM
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althom1122 sums up why the USA has not made the conversion to the metric system: "I wish we'd gone metric back when it was being talked about. I was in junior high at the time and probably could have made the shift, although even then it would have been tough. Now (as an old dog) it would be much harder."

"Old dogs" inhabit Congress and make the laws. Old dogs don't want to learn new things. Public school students still learn metric system in almost every math and science class, but, unfortunately, it's largely a waste of time.

In 1866, the U.S. Congress authorized the use of the metric system and almost a decade later America became one of 17 original signatory nations to the Treaty of the Meter. A more modern system was approved in 1960 and is commonly known as SI or the International System of Units.

In 1968, Congress authorized a three-year study of systems of measurement in the U.S., with particular emphasis on the feasibility of adopting.

Congress passed the Metric Conversion Act of 1975 "to coordinate and plan the increasing use of the metric system in the United States".

The American National Metric Council (ANMC) was established in 1973 by the American National Standards Institute (ANSI) as a non-profit, tax-exempt organization for planning and coordinating metric activity in all sectors of the U.S. economy. The ANMC became a separately incorporated organization in 1976.
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Old Jun 2nd, 2017, 08:39 AM
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The pyramid inch is a division of the measurement between north and south poles measured through the center of the earth. The meter is a division of the measurement between the north and south poles, measured over the surface of earth, I think the line runs through France, but, if you were to measure at another location, the distance between poles would be different due to the geology or topography, so the inch is a true unit of measure on earth.... Temperature, well, the metric would be a better choice if I didn't already know Fahrenheit as my go to scale.
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Old Jun 18th, 2017, 08:37 AM
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Fellow baby boomers. what a mess! I live in the midwest United States. Illinois to be specific. I'm a retired RN. Irrelevant! It's what you grow up with that becomes your go-to. Not effective. So even though I'm no dummy, I sometimes need help. So...thank goodness there's an app for that!!
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Old Jul 4th, 2017, 07:06 AM
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The easiest way to convert, and I'm surprised that it's not on here, my dad and I figured out. Take the C temp and double it, subtract 10% and then add 32. Everyone can do 10% of something. It's mathematically the same as doing the Cx9/5+32=F equation, only doesn't involve fractions. You're welcome.
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Old Jul 14th, 2017, 02:25 AM
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When Britain went metric in the 1970s, a national competition to find handy tips for conversion produced two great winners: 'A liter of water's a pint and three quarters', and, more relevant to this discussion, a verse that tells you all you need to know if you only care about what to wear to suit the weather: '10, 15 and 21 - winter, spring and summer sun.' (Of course, this only works for Britain, not Arizona, Lapland, or Singapore.)
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Old Jul 31st, 2017, 03:35 AM
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For Dlph311:
Please go back a bit and reread.
(You're also welcome!)

"Celia on Nov 12, 09 at 12:57pm
In my travels I have developed a "feel" for kilometers, so I don't need to convert them. But for temperature, I haven't been able to develop a feel, so I do what's described here, with a slight difference. I double the Celsius number, subtract 10% (that's where I differ from others) and add 32. That's close enough to let me know whether I want a swim suit or .."a.snow parka.
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Old Aug 3rd, 2017, 02:00 PM
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This thread is so old I don't know why I'm bothering, but Percy's post on Nov 12 is just ludicrous.

I'm a born and raised Canadian and there is zero truth to the notion that people here do not like the metric system. I cannot recall a single complaint since I was a small child and the system was quite new. Not ONE.

Also stupid: the idea of metric police. The country moved to a new system, and yes, stores were required to comply and a few did not. You can't have stores all using whatever system they like. There was no gestapo as Percy suggests but stores were required to use metric (they were allowed to have imperial as well, as long as the metric weight was listed. Horrors!).

Also, if you know someone who raised in Canada and learned metric in school, I cannot imagine how that person would end up only understanding miles given that no one in this country uses miles for distance or speed. Ever. Maybe his parents were resistant and only used miles at home? Or this is just BS? My parents would be in their eighties now if alive so they grew up with imperial and learned metric in their forties, and after a few years to adjust, they only used C for temperatures, and kilometers for distance and speed. So this nephew that only uses miles in Canada is an isolated case and not the norm. I haven't heard a Canadian use miles for anything in the last couple of decades at least.

We do have a quirk. Canadians tend to use feet and inches for human height and pounds for human weight (that is changing). And the British still use stone for human weight. A quirk does not mean we are not using metric, it's just a quirk.

Also, if none of your Canadian friends talk to you in metric, it's because they know you will not understand it. Canadians are hyper aware that American's don't understand it so we usually will look things up in imperial when talking to you. I have an American aunt and I always look up the temperature in fahrenheit when I'm relating it to her. It's polite. Canadians are kind of known for being polite. Also, we call is celsius. No one calls is centigrade. Not that it matters. I get what you meant.

I have noticed that sometimes when Americans confront a change that Canada has already gone through, they speak authoritatively about how it really went wrong for Canada and they have all this inside information on how Canadians feel. When Obamacare was coming in, all I heard was how Canadians hate our health care system, and we can't even choose our own doctors (total hogwash, and there were so many other lies told to Americans about our health system around that time). Please, leave us out of it and speak for yourself, please. It's so frustrating to always read how Canadians feel and it has no relation to what is going on here. And dont' assume that a couple of people you know represent a country.

A final note. "Oh yes, Canada thought their trade would boom internationally when they converted to metric.... A government study later on proved that was not the case. "

WTF? I just asked around. No one has ever heard of anything to support that statement. I'd love to see some evidence on that one. Our economy is just fine, thanks. A couple of years ago our dollar was worth quite a bit more than yours. Not right now. Still, better than many countries. I'd love to see that study. I'm a university researcher and could find nothing to support this. Link please! Can't wait to read it.
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Old Aug 18th, 2017, 10:34 AM
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The shortcut is actually calculating a value for Fahrenheit that's equal to (1.9C + 32), rather than the actual (1.8C + 32).

The formula IS Fahrenheit degrees minus 32 times 5/9!
212-32=180 180 times 180=180 divided by9=20 times 5=100!

The other formula is Centigrade degrees times 9/5 + 32.
100 times 9=900 divided by 5=180+32=212 viola!
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Old Aug 18th, 2017, 10:39 AM
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To sdb2 on Nov 11, 09 at 9:53am

The Fahrenheit degrees = Centigrade times9/5 or 100 times 9=900 divide by 5=180+32=212. Viola
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Old Oct 18th, 2017, 11:20 AM
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Several people have posted that doubling the Celcius value, subtracting 10%, and then adding 32F gives you 1.9C + 32.

That is not true.

The procedure gives you 1.8C + 32 and is a valid way of converting from C to F.

Subtracting 10% is the same as multiplying by 0.9. So, if you double and then multiply by 0.9 you get 2 * 0.9 = 1.8, not 1.9.

Another way of looking at it is that 10% of 2 is 0.2. Subtracting 0.2 from 2 gives you 1.8.

Let's do an example to prove it works.

100C -> double it gives 200, subtract 10% (or multiply by 0.9) gives 180, then adding gives 212F which is the correct answer.

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