...On Math

The evolution in teaching math since the 1950s:

1. Teaching Math In 1950s
A logger sells a truckload of lumber for $100. His cost of production is 4/5 of the price. What is his profit ?
2. Teaching Math In 1960s
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?
3. Teaching Math In1970s
A logger sells a truckload of lumber for $100. His cost of production is $80. Did he make a profit?
4. Teaching Math In 1980s
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.
5. Teaching Math In 1990s
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 aliving? Topicfor 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, and if you feel like crying, it's ok. )
6. Teaching Math In 2009
Un hachero vende una carretada de maderapara $100. El costo de la producciones es $80. Cuantodinero ha hecho?
 7. Teaching Math In 2013
Whocares, just steal the lumber from your rich neighbor's property. He
won't have a gun to stop you, and the President says it's OK anyway cuz
it's redistributing the wealth.