What does dilation feel like?
I recently had the opportunity to work with a group of students who were testing activities that treat geometric transformations as functions (what I call

*geometric functions*). I got lots of good ideas for improving the activities not only by watching the students, but also but also from their suggestions …

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For the past month, I've focused this blog on the role that computers can play in assessing students' mathematical knowledge. I've presented three

Web Sketchpad-based examples of assessment with mathematical topics ranging from

isosceles triangles, to the

Pythagorean Theorem, to the

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Today there is no lack of outrage directed at the high-stakes standardized testing that has become so prevalent in the U.S. educational system.

A recent opinion piece in

*The New York Times* examines the backlash against the Common Core and lays the blame not on the standards themselves, but rather …

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In my

previous post, I shared

Dan Meyer's analysis of what's wrong with computer-based mathematics assessments. Dan focuses his critique on the Khan Academy's eighth-grade online mathematics course, identifying 74% of its assessment questions as focusing on numerical answers or multiple-choice items. This is …

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## The Web Sketchpad and Math Education Blog