Last week I purchased a burger and fries at McDonalds for $3.58.
>
> The counter girl took my $4.00 and 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 1960s...
>
>
> Teaching Math In 1960
>
> 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 1970
>
> 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 1980
>
> A logger sells a truckload of lumber for $100. His cost of production is
> $80. Did he make a profit?
>
>
>
> T eaching Math In 1990
>
> 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 2000
>
> 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.)
>
>
> Teaching Math In 2006
>
> Un ranchero vende una carretera de madera para $100. El cuesto de la
> produccion era $80. Cuantos tortillas se puede comprar?