Fifty Years of Math 1959 - 2009 (in the  USA )
   
   Last week I purchased a burger at Burger King for $1.58. The
counter girl took my $ 2 and I was digging for my change when I pulled
8 cents from my pocket and gave it to her. She stood there, holding the
nickel and 3 pennies, while looking at the screen on her register. I
sensed her discomfort and tried to tell her to just give me two
quarters, but she hailed the manager for help. While he tried to explain the
transaction to her, she stood there and cried... Why did I tell you
this?

Because of the evolution in teaching math since the 1950's:

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 In 1970s
   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 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, and if you feel like crying, it's ok. )
   

6. Teaching Math In 2009
   Un hachero vende una carreta de madera por $100. El costo de la
produccion es $80. Cuanto dinero ha hecho?