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? Please read more about the "History
of Teaching Math".

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**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?

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**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?

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**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.

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**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 birds and squirrels feel as the logger cut down the trees? (There are
no wrong answers)

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**Teaching Math
In 2005**:
El
hachero vende
un camion carga por
$100. >La cuesta de production
es............. :-\