Math Forum Online PD Courses
Our next professional development courses start soon:
To see what teachers have said about past courses upon
completing them, check out
The only technical requirements are a web browser and
Registrations begin closing Thursday, 8 January, 2015.
PoW taking place: math problem-solving moment of the week
"First I see that it's like a connect-the-dots. It has an
order but the answer is not always right next to the previous
number. I started by drawing a table.... I found them all out,
but it doesn't answer the question. To find the answer ..."
- Eli, highlighted in the FunPoW's Latest Solution
Math Girls Talk About Trigonometry
Bento Books has published the third volume in its Math Girls
spinoff series, Math Girls Talk About...
Math Girls Talk About Trigonometry explores a variety of fun
and informative topics in trigonometry. Check out the first
chapter, full table of contents, and index in this
This new book ranges from basics like defining the sine
function to less frequently seen topics like Lissajous curves.
It consists of five chapters, each with review problems
Back and Forth
Around and Around
As with the first two volumes from this series, the math topics
in Math Girls Talk About Trigonometry arise out of
conversations among the characters from the young adult novel
Mathematical Girls — also by author Hiroshi Yuki — the
Japanese language version of which has already gone through
some twenty printings.
For more of Bento Books' publications, first featured in these
pages three years ago, check out
Now taking place: math education conversation of the day
"Given a 3-frequency geodesic sphere (icosa-based,
ominitriangulated), how many triangular facets does it have,
and how many edges and vertexes? We just need to plug in the 3
to get V (number of vertexes), subtract 2 to get N, then the
ratio N:F:E is 1:2:3, so we're done. But how many sixth graders
even know that? Too much algebra?"
- Kirby, posted to the math-teach discussion
Foldable Calendar Polyhedral Models
Want a 2015 calendar to ring in the new year mathematically? Or
a timely manipulative to engage your geometry students? Or a
last-minute handmade gift for the geek-who-has-everything?
Download a polyhedron net and fold up your own
three-dimensional, 365-day calendar!
British publishers Cleave Books offer these 3-D models
formatted to print out on standard 8.5" × 11" paper: