Y'All,
Speaking of Math tricks. I often made my math tests for the 6-7-8 grades so
that the answers could easily be checked just by doing
the sum of the digits. Works for addition, subtraction, multiplication and
division. Find it in the Encyclopedia Britannica. Not perfect if numbers
in the answers are transposed but otherwise a quick check
when you have many papers to correct. More if you wish.
Gene Whitt