> 71"9/32 which is easy to solve in your head as 69" / 3 + 2"/3
> + (9/32)/3 

I might have gone the other way seeing as it's so close to 6ft

72/3 - ((32-9)/3)

> Now, in your head, what is a third of 4m 22cm 5mm ?

> You see, multiple units is never a good thing for mental math... but, 
> even converted to a single unit 4225 / 3 ?

4200/3 is an easy one, if you know your 1400 times table, then +25/3.
One of my pocket money jobs is cutting mdf sheet for a picture framer
and that's all done in mm, with a little mental planning sometimes to
work out the best cut from an 8 x ... ooops, a 2440 x 1220 sheet

Not prosyletising for either, each has its merits

The only imperial measure I've got left is dad's old fold-up carpenter's
rule. Everything else is metric. And I do look out for an imperial ruler
as I still make my own PCBs and it's helpful to transfer some drawing
measurements on gridded paper to the copper

Now that I think of it, I should print my own 0.1" scale and laminate it

And every time I use it I'll bang on Elgar's Pomp And Circumstance
March No1 at a volume sufficient to waken dead heroes and shed a
silent tear for days gone by

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