Todays learning is really for the 22nd, but since I am still up on the 23, we will still count it as the 22nd and have a new one for latter today on the 23rd.
There is a multitude of ways to go about changing C to F. One that is too complicated for "in your head" math, another that is a bit simpler, and yet another I feel is the easiest. I will focus on the last two.
First: Have your number..18 C. Take 18 multiply it by 9. 18x9=162, then devide it by 5. 162/5=32.4. Then add 32. 32+32.4=64.4 F. Fairly simple, but still a bit hard to do in your head.
I have another way that will come very close and is easily done in your head. 18C again. Take 18 multiplied by 2. 18x 2=36. Then subtract the first number of the answer (3), unless the second number is > or = to 5 then round up, as in this case. 36-4=32. Then add 32. 32+32=64 F.
Try it out with some different numbers. It may sound complicated at first but it will take no time once you get the hang of it. Todays first example was taken from About.com.
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Interesting things to do at 3AM. Math gives me a headache.
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