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I am undergraduate math student who is interested in being a high school math teacher. I have been given an assignment to present to my class (for a total of about 20 minutes) a teaching tool or a teaching strategy that will enhance students’ (high school students) learning of a particular secondary mathematics topic. For example, I have a friend who is presenting https://www.canfigureit.com/, which can help students better understand and set up geometric proofs.

I don't know any websites/apps to teach mathematical concepts except for https://www.mathsisfun.com/, but this website is very generic and can be used to teach many different topics.

I was hoping that you can respond with websites/apps that you found helped high school students to discover a specific mathematical concept/topic.

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    $\begingroup$ This is a little broad. Do you have any specific mathematical concepts in mind? If you said, "I'm looking for apps/websites that teach geometry", then you might get better answers. $\endgroup$
    – Brendan W. Sullivan
    Sep 9, 2020 at 20:29
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    $\begingroup$ Have you looked at the NCTM illuminations site? They have a lot of wonderful lessons and interactives for grades 9-12. $\endgroup$
    – Amy B
    Sep 9, 2020 at 21:12
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    $\begingroup$ Sticking with the geometry theme, a very good general site is Geogebra, which has ample resources. Even some stat and algebra stuff. Of course, there's also Desmos classroom, which I frequently use with my students. $\endgroup$
    – Andrew Sansom
    Sep 9, 2020 at 21:40
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    $\begingroup$ @AmyB Thanks for pointing that out. Despite being a subscriber for NCTM (by force, I must say), I wasn't aware of the NCTM illuminations site. $\endgroup$
    – AfronPie
    Sep 9, 2020 at 21:43
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    $\begingroup$ @AfronPie It depends a lot on the class and the topic. Recently I've been using digital AlgebraTiles to teach quadratic everything for remote instruction. There are similar resources on NCTM Illuminations. I frequently use Desmos activities. A couple semesters ago, when a class was struggling with logarithms, I used a digital sliderule to make things tangible. Surprisingly, I've never had to teach trig, but while tutoring, PHeT has a nice simulation that helps. $\endgroup$
    – Andrew Sansom
    Sep 9, 2020 at 22:11

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