50 years of math: 1957-2007

Last week I purchased a burger at Burger King for $1.58.  The counter
girl took my $2 and I was digging for my change when I pulled 8 cents
from my pocket and gave it to her.  She stood there, holding the
nickel and 3 pennies, while looking at the screen on her register.  I
sensed her discomfort and tried to tell her to just give me two
quarters, but she hailed the manager for help.  While he tried to
explain the transaction to her, she stood there and cried.  Why do I
tell you this?

Because of the evolution in teaching math since the 1950’s:
1. Teaching Math In 1950’s

A logger sells a truckload of lumber for $100. His cost of production
is 4/5 of the price.  What is his profit ?

2. Teaching Math In 1960’s

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?

3. Teaching Math In 1970’s

A logger sells a truckload of lumber for $100.  His cost of production
is $80.  Did he make a profit?

4. Teaching Math In 1980’s

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.

5. Teaching Math In 1990’s

A logger cuts down a beautif ul 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, and if you feel like crying, it’s ok.)

6. Teaching Math In 2007

Un hachero vende una carretada de maderapara $100.  El costo de la
producciones es $80.  Cuanto dinero ha hecho?

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