I have noticed that many people have no “feel” for numbers. If they use a calculator to multiply 41 x 82 and they enter it incorrectly and the answer comes up 336200 they are apt to think that is correct. I learned arithmetic the old way long ago and it instantly flashes in my mind that 40 x 80 is 3200 so there is no way the answer could be six figures long. Terms like 1/4, .25, .250, 0.25, 25% etc. all look the same to me, some people seem to need a calculator and a book to figure out that 1/4 of a pound is the same thing as .25 x 1 pound or 25% of a pound and all are equal to four ounces.
Amazingly enough to me most adults don’t seem to know how many feet are in a land mile, let alone a nautical mile. When I was in grade school I learned that a land mile is 5,280 ft. and a nautical mile is 6000. I could not forget those if I tried, if I ever cannot remember them I will know that I am entering dementia.
The old British nautical mile is 6080 feet. The international nautical mile is 1852 meters, or 6076.115 feet.