How math lessons have changed through the years.

1. The teaching of mathematics in 1950

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

2. The teaching of mathematics in 1960

A logger sells a truckload of lumber for $ 100. His cost of production is 4 / 5 the price, or $ 80 What is its purpose?

3. Teaching Math in 1970

A logger sells a truckload of lumber for $ 100. Its production cost is $ 80. Is there a profit?

4. The teaching of mathematics in 1980

A logger sells a truckload of lumber for $ 100. Its production cost is $ 80 and his profit is $ 20. Their mission: Underline the number 20.

5. Teaching Math in 1990

A woodcutter kills a beautiful forest because he is selfish and inconsiderate and do not care about the habitat of animals or the preservation of our forests. He does this so you can get a profit of $ 20. What do you think of this way of living? Issue of class participation after answering the question: How birds and squirrels feel as the logger cut their homes? (There are no wrong answers.)

6. The teaching of mathematics in 2007

A hachero come una carretada the maderapara $ 100. El costo es de producción of $ 80.