Quarters and halfs are as easy (I'd even say easier) in metric: 0.5 and 0.25 and the nice thing is you don't need to convert fractions to add/substract them. 2

Quarters and halfs are as easy (I'd even say easier) in metric: 0.5 and 0.25 and the nice thing is you don't need to convert fractions to add/substract them. 2.75 - 1.5 is much easier for me than 2 and 3/4 - 1 and 1/2 Another advantage is that half cm is roughly a quarter inch, so you usually don't need to go down to quarters, just use wholes and halves (or millimeters if you need precision). I'm not sure imperial is easier for thirds in practice. I have 2 by 4 inches (5x10 cm) board and want to drill 2 equally spaced holes at 2/3 inches and 4/3 inches into it - how would I do this? There's no 1/3rd inch on an imperial ruler? I google and I got this :) https://science.blurtit.com/1709608/where-is-13-of-a-inch-located-in-a-ruler https://science.blurtit.com/1709608/where-is-13-of-a-inch-lo... I agree base 12 or base 60 "decimals" would be the best of both worlds.