Monthly Archives: May 2012

Manipulatives: Use With Caution!

Math manipulatives are concrete objects used as props in math education. As mere objects, they are, in and of themselves, not a bad thing. What is terrible is how they are often used in instruction.

Posted in Math Education | Tagged , , , | Leave a comment

Back to Basics: Multiplication is NOT the Inverse of Division!

I often hear the mantra, “Multiplication is the inverse of division.” The bottom line: it’s wrong. And, since it does cause confusion for some, it’s a good idea to stop saying it. Basically, it is an oversimplification. Here’s what is … Continue reading

Posted in math, Math Education | Tagged , , , | 3 Comments

2011 Math Prize for Girls: #1-5

Here are comments and solutions to problems 1-5 on the 2011 Math Prize for Girls contest that took place at MIT on September 17, 2011. Earlier I blogged comments and solutions for problems 6-10, problems 11-15, and problems 16-20.

Posted in Contest Math | Tagged , | 1 Comment