http://www.ted.com In a lively show, mathemagician Arthur Benjamin races a team of calculators to figure out 3-digit squares, solves another massive mental equation and guesses a few birthdays. 324 more words

## Tags » Math

#### When A Sine Wave Is a Circle

When y=sin(x) is plotted on a polar coordinate system, with everything set, consistently, to radians, the resulting graph is a circle sitting atop the origin, with unit diameter.

#### ¡Amamos triángulos

Triangles and fairy tales go together like wolves and pigs. As teachers, we revel in their many symbiotic relationships: those trichotomous pigs, questions, bears, problems, porridges, knocks at the door, and stepsisters inspire us to view the three angles and lines of a triangle in a multitude of ways. 150 more words

Rod & Staff Understanding Mathematics 6 Homeschool Student & Teachers Manual

Rod & Staff Understanding Mathematics 6 Homeschool Student & Teachers Manual

Both volumes of Teacher’s Manual are in like new condition. 30 more words

#### Math Problem of the Day

I’ve seen this idea many times before, but I’ve most of the pages I’ve seen are too “cutesy” to get away with in 6th grade. I made this one that’s pretty standard and has enough space for kids to adequately explain themselves. 78 more words

#### Speed Up Factor

I watch a lot of Coursera videos and usually view them at 1.25x or 1.5x normal viewing speed. I started thinking about how much that would translate into viewing time. 258 more words

#### Quiz! Open Notes and Books

By Vic Odarve

Have you heard a teacher informing the class that your next quiz is open notes, books, etc.? It is really almost open everything! 650 more words