Teaching?

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 1960A 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 2006 Un ranchero vende una carretera de maderapara $100. El cuesto de la produccion era $80. Cuantos tortillas se puede comprar?

Hat tip to Mo Mo.