Doing math in one's head, or the lack of ability to do so
...reminds me of my long ago days of running tree planting crews on US Forest Service lands.
To set the stage for understanding my point...6 or even 7 days a week, getting up at 2:30 am, load out seedlings and meet the contract planting crew at 4:30 am, drive an hour or even more to the planting site, work hard physical labor 8 to 9 hours, drive the hour back to the station, spend another hour on restock, records, and daily email report to the contract officer.
Drag home, shower and feed yourself the wonderful (though often reheated) dinner my magnificent wife has fixed for us, fall into bed for hopefully maybe 5 hours sleep before the bell rings at 2:30 again.
Back to doing to the math in your head
. I was always able to measure just how sleep deprived I was getting by my ability, and increasing inability, to do relatively simple math in my head as the planting season lengthened.
An example: 12 planters x 225 trees per bagout=2700 trees per bagout. 4 bagouts x 2700 trees=10,800 trees. 10,800 trees divided by 24 acres (estimated from long experience, pacing grid, and WAG
) = 450 trees per acre planted, average.
That's the sort of running in-head math a tree planting foreman must keep calculated.
At the beginning of the season, I could do this in my head, easily. At 3 weeks in, barely. 6 weeks in, not at all...had to write it all down, every bagout. 8 weeks in...don't even ask; I could barely find the ranger station at 3:30 am
.