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

************************ By cutting down beautiful
forest trees, the
logger makes $20. What do you think of this way of
making a living? Topic for class participation after answering the
question: How did the forest birds and squirrels feel as the logger cut down the
trees. (There are no wrong answers.)


Teaching Math In 2005

************************
El hachero vende un camion carga por $100. La cuesta
de production es