
We don’t really need any of those mnemonics because it’s a perfect system
More seriously there is the “King Henry Died, Drinking Chocolate Milk” for the Kilo (1000) Hecto (100) Deca (10), Deci (0.1) Centi (0.01) Milli (0.001), but that doesn’t really help with measuring on the spot, aside from being able to get the prefix right.
There’s an average step being 1 meter, but thats less useful for people with shorter legs unless they want to join the ministry of silly walks.
One that I use often is converting meters per second to kilometers per hour. Because 1 meter per second is 3600 meters per hour or 3.6 kilometers per hour, you can actually skip the multiply by 3600 and then divide by 1000 and just multiply by 3.6.
But aside from time conversions, there isn’t really anything else that can help because it’s just moving the decimal.
Slightly related, you can tell how far away lightning is by listening for the thunder and counting the seconds. Sound travels at 346 m/s so every 3 seconds is roughly 1 kilometer away. But I suppose you can do the same for miles and count to 5.
So much this! I love a challenging game but sometimes you just want to experience the game without the frustration, and lowering the difficulty for yourself has zero impact on people who prefer the original or higher difficulty