A couple of motoring examples:
On holiday in a hire car, I had one of the mechanical linkages from the throttle to the carburetor come apart ( the nut fell off ). I lashed the two parts together with string which enabled me to drive to the hire company and not waste too much of my holiday.
In the old days when the rear part of an exhaust pipe rusted through and rear silencer then scraped the ground, some bailing wire, if available, or a thin metal coat hanger could be used to lash the box to the underside of the car.
Both these achieved a short term solution and allowed progress to be made but knowing that in the long term there was a " correct " way to do things.
In every day life before electronics :-)
Adding up a small column of 2 digit numbers :- Just add up the 10s will give you rough idea of the total and ensure you are not way out.
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Getting positives from old odd sized nega.. new
Getting positives from old odd sized n.. new