Math is hard

Math teaching then and now. This one has been going round the Internet for a while, but non-mathematical readers might have missed it. It demonstrates the changes in math teaching techniques across the years.

Teaching math to American kids 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?

- 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?

- 1970: A logger exchanges a set "L" of lumber for a set "M" of money. The cardinality of set "M" is 100. Each element is worth one dollar. Make 100 dots representing the elements of the set "M." The set "C", the cost of production, contains 20 fewer points than set "M." Represent the set "C" as a subset of set "M." Answer this question: What is the cardinality of the set "P" of profits?

- 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.

- 1990: By cutting down beautiful forest trees, the logger makes $20 profit. 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.

- 2000: A logger sells a truckload of lumber for $100. His cost of

production is $120. How does Arthur Andersen determine that his profit

margin is $60?

- 2010: El hachero vende un camion carga por $100 La cuesta de produccion es.....

Math teaching then and now. This one has been going round the Internet for a while, but non-mathematical readers might have missed it. It demonstrates the changes in math teaching techniques across the years.

Teaching math to American kids 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?

- 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?

- 1970: A logger exchanges a set "L" of lumber for a set "M" of money. The cardinality of set "M" is 100. Each element is worth one dollar. Make 100 dots representing the elements of the set "M." The set "C", the cost of production, contains 20 fewer points than set "M." Represent the set "C" as a subset of set "M." Answer this question: What is the cardinality of the set "P" of profits?

- 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.

- 1990: By cutting down beautiful forest trees, the logger makes $20 profit. 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.

- 2000: A logger sells a truckload of lumber for $100. His cost of

production is $120. How does Arthur Andersen determine that his profit

margin is $60?

- 2010: El hachero vende un camion carga por $100 La cuesta de produccion es.....

## Comment