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# Teaching Maths over the years

Teaching Maths In 1970
A logger sells a truckload of timber for \$100.
His cost of production is 4/5 of the price.
What is his profit?

Teaching Maths In 1980
A logger sells a truckload of timber for \$100.
His cost of production is 4/5 of the price, or \$80.
What is his profit?

Teaching Maths In 1990
A logger sells a truckload of timber for \$100.
His cost of production is \$80.
Did he make a profit?

Teaching Maths In 2000
A logger sells a truckload of timber for \$100.
His cost of production is \$80 and his profit is \$20.
Your assignment: Underline the number 20.

Teaching Maths In 2008
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. )