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 1960

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?

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.)

SOOOOO true.