It's unfortunate that some countries still use the Fahrenheit system. It would be so much easier if everything was in Celsius. But because the United States still uses the Fahrenheit system, knowing the conversion of Celsius to Fahrenheit will help when speaking to Americans.
Usually, it takes some time to convert degrees using the conversion method. So it's easier to have general temperatures already memorized. Here is a small table so you can quickly respond when talking with a foreigner about the temperature.
You don't need to remember everything. But if you know a couple of numbers you can just change the other number slightly. For example, if you know that 80 degrees is about 27 degrees Celsius, then if the temperature is 77 degrees, you can figure that it will be about 25 degrees Celsius. Also, you don't have to be very accurate. In conversation, many people just want general numbers and being off by a half a degree will not do any harm.
Finally, during the winter months, it gets so cold that the temperature goes below 0 degrees Celsius. Let's practice a few sentences using negative numbers.
Remember, although numbers below zero are negative numbers, it's not common to say, 'Negative 2 degrees.' It's not wrong to say it and everyone will understand, however, when speaking to many people, almost everyone says 'minus 2 degrees.' Another common way to say it is below zero is to say, '2 below' as in the example above.
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