> Also BTW, eggs are also sold in 10s in at least some metric countries. I know because I have to buy them and it means I'm left with one left over every time.

> Also BTW, eggs are also sold in 10s in at least some metric countries. I know because I have to buy them and it means I'm left with one left over every time. 12 eggs works for an individual, a couple, and a family of 3 or 4, and for more combinations of portion than 10 does. > Want more accuracy? You can say it's 1.1551 kilometers or 1155.1 meters long, your accuracy is now better than a foot That's precision, not accuracy. > Now quick, without googling… I already know it's a mile squared, why do I care about how many square feet there are? That's the point, you choose the measure that is appropriate, without knowing the aim how can you choose a measure? “How big's that field?” “A mile by a mile” "Wow. Can I have some eggs, please?” “Well, I've only got 10's. I hope you have exact change…”