ALoafOfBread, 1 year ago (edited 1 year ago) For easier mental C -> F conversion, take (2C)-(2C/10)+32 where C = temp in c. 16c × 2 = 32 32/10 = 3.2 32 - 3.2 = 28.8 28.8+32 = 60.8, which is exactly correct. Or if you just want a rough estimate for weather, 2C+(22 to 32) gets you close enough with easier mental math 16x2+30 = 62, just 1 degree off. 37x2+30 = 104 is like 6 degrees off, though. The further from zero you are, the smaller the number you should add.
For easier mental C -> F conversion, take (2C)-(2C/10)+32 where C = temp in c.
16c × 2 = 32
32/10 = 3.2
32 - 3.2 = 28.8
28.8+32 = 60.8, which is exactly correct.
Or if you just want a rough estimate for weather, 2C+(22 to 32) gets you close enough with easier mental math
16x2+30 = 62, just 1 degree off.
37x2+30 = 104 is like 6 degrees off, though. The further from zero you are, the smaller the number you should add.