# Teaching Math Through the Decades

 This year All years
1950: A logger sells a truckload of lumber for \$100. His cost of
production is four-fifths the price. What is his profit?

1960: A logger sells a truckload of lumber for \$100. His cost of
production is four-fifths the price, or \$80. What is his profit?

1970: (new math) A logger examines a set L of lumber for a set M of money.
The cardinality of the set M is 100, and each element is worth \$1.00. Make
100 dots representing the elements of the set M. Represent the set C as a
subset of M, and answer the following question: What is the cardinality of
the set P of profits?

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.

1990: (outcome-based education) A logger cuts down a beautiful forest and
makes \$20 profit. What do you think of his way of making a living? How did
the forest birds and squirrels feel?

2001: A lumber company lays off 45% of its loggers and improves its stock
price from \$80 a share to \$100 a share. How much capital gain per share
does the CEO make by exercising his stock option at \$50?