Teacher Review for Math Open Reference

Dynamic mathematics that students can actually play with

Patrick B.
Classroom teacher
Coachella Valley High School
Thermal, CA
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My Grades 9, 10, 11, 12
My Subjects Math
My Rating
Learning Scores
My Students Liked It Yes
My Students Learned Yes
I Would Recommend It Yes
Setup Time Less than 5 minutes
Great for Individual
Knowledge gain
Small group
Student-driven work
Teacher-led lessons
Whole class
Great with Advanced learners
How I Use It
I use this website in many ways. For constructions, I use the animations to demonstrate the steps to bisect an angle, construct a perpendicular bisector, etc, prior to having students perform the constructions. I then set the animated constructions to loop while the students perform the construction with their own compass and straightedge. This method is more engaging and easily understood than using a whiteboard compass, and students can refer to the looping animation if they forget a step. I also use this site for its vast library of vocabulary definitions with interactive animations. I use this for both teacher led lessons introducing the vocabulary as well as student led inquiry into the vocabulary.
My Take
This website has an excellent section dedicated to geometric constructions. The number of constructions is just as impressive as the quality found in each one. You can find every construction mentioned in the Common Core State Standards for geometry, in addition to many more for your advanced learners. Each construction includes a step-by-step animated demonstration of the construction, a list of the steps for offline use, and a formal proof of the construction. And this is just the beginning. There is also a page on the site dedicated to the Common Core State Standards that hyperlinks each standard to related content. The creator is very active and always adding more valuable content. I like the comprehensive coverage of the geometry curriculum on this site and the dynamic, interactive animations that illuminate otherwise abstract mathematical concepts. There are ads on the site (mostly educational), so be aware of this as your students access the content. One additional comment: the site has been updated to be compatible with the iPad! This is exciting for me, since my students are using iPads.