Double the number, then reduce by one-tenth the doubled number, then add 32
Example: To convert 25 C double it to 50, reduce by 5 to get 45, then add 32 to get 77 F.
The reason this works is because 9/5 = 10/5 - 1/5. And the nice thing about this is that it is an exact conversion not an estimation.
“Easy”
Ok maybe a bit of a stretch, but definitely easier than directly calculating 9/5ths.
9/5 is easy though, you double then subtract a tenth