Finding the Limit

[Rescued from my old blog.]

Eldest dd had her first calculus lesson last night: derivatives. The teacher found the speed of a car at a given point by using the distance function, calculating the average speed over shorter and shorter time intervals. Dd summarized the lesson for me:

“If you want to divide by zero, you have to sneak up on it from behind.”

Of course, she understands you can’t really divide by zero, but I thought her tongue-in-cheek comment was a pretty good description of the process of finding the limit as delta-t approached zero.


howtosolveproblemsWant to help your kids learn math? Claim your free 24-page problem-solving booklet, and sign up to hear about new books, revisions, and sales or other promotions.

Math Humor, and Some Copywork Resources

[Rescued from my old blog.]

I have been reading up on Charlotte Mason’s teaching style, and I plan to incorporate more copywork and dictation into our school program next year. Here are a few of my favorite funny quotes about math. (These would also make great blackboard quotes for a math classroom.)

Continue reading Math Humor, and Some Copywork Resources

So You Think You Know Calculus?

[Rescued from my old blog.]

Rudbeckia Hirta over at Learning Curves submits a great idea for a new TV blockbuster:

So You Think You Know Calculus?

I’ve read that Charlotte Mason used oral exams like this with her students, though of course without the pressure and sarcastic comments. I’d love to hear how this works in “real life.”

Continue reading So You Think You Know Calculus?