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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 sells a truckload of lumber for $100. His cost of
production is $80. Did he make a profit?

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
A logger cuts down a beautiful forest because he is selfish and
inconsiderate and cares nothing for the habitat of animals or the
preservation of our woodlands. He does this so he can make a profit
of $20. What do you think of this way of making a living? Topic for
class participation after answering the question: How did the birds
and squirrels feel as the logger cut down their homes? (There are no
wrong answers.)

Teaching Math In 2010
Un ranchero vende una carretera de madera por $100. El cargo de
produccion es $80. Cuantas tortillas se puede comprar.