We looked at comments below and found one comment interesting. When you convert Fahrenheit to Celsius (as shown above), the last thing you need to do is multiply by 5/9 or .5556. Since 5/9 is only approximately equal to .5556, you do get slightly different answers depending on whether you use 5/9 or .5556. The commenter suggests that instead of multiplying by 5/9 or .5556 that you divide by 9/5 or 1.8. This is because 9/5 is exactly equal to 1.8 and, therefore, you will avoid getting slightly different answers. The only drawback that we see in using this method is that it is not the formula you normally see in textbooks (if that’s a concern).
We looked at comments below and found one comment interesting. When you convert Fahrenheit to Celsius (as shown above), the last thing you need to do is multiply by 5/9 or .5556. Since 5/9 is only approximately equal to .5556, you do get slightly different answers depending on whether you use 5/9 or .5556. The commenter suggests that instead of multiplying by 5/9 or .5556 that you divide by 9/5 or 1.8. This is because 9/5 is exactly equal to 1.8 and, therefore, you will avoid getting slightly different answers. The only drawback that we see in using this method is that it is not the formula you normally see in textbooks (if that’s a concern).