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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 carretada de madera para $100. El costo de la producciones es $80. Cuanto dinero ha ganado?

7. Teaching Math In 2016 and on.
Who cares, 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.