Teaching Math Through the Years (in the U.S., at least...)

                Teaching Math in 1950: A logger sells a truckload of lumber
for $100.  His cost of production is 4/5 of the price. What is his profit?

                Teaching Math in 1960: A logger sells a truckload of lumber
for $100.  His cost of production is 4/5 of the price, or $80. What is his
profit?

                Teaching Math in 1970: A logger exchanges a set "L" of
lumber for a set "M" of money.  The cardinality of set "M" is 100.  Each
element is worth one dollar.  Make 100 dots representing the elements of the
set "M."  The set "C", the cost of production, contains 20 fewer points than
set "M."  Represent the set "C" as a subset of set "M" and answer the
following question: What is the cardinality of the set "P" of profits?

                Teaching Math in 1980: A logger sells a truckload of lumber
for $100.  His cost of production is $80 and his profit is $20. Your
assignment: Underline the number 20.

                Teaching Math in 1990: By cutting down beautiful forest
trees, the logger makes $20.  What do you think of this way of making a
living?  Topic for class participation after answering the question: How did
the forest birds and squirrels feel as the logger cut down the trees?  There
are no wrong answers.

                Teaching Math in 2000: A logger sells a truckload of lumber
for $100.  His cost of production is $120.  How does Arthur Andersen
determine that his profit margin is $60?

                Teaching Math in 2010: El hachero vende un camion carga por
$100.  La
                > > cuesta de producion es...