2

The Kahn Academy is quite extensive, and in my experience of high quality. It is partitioned by grades (kindergarten, 1st, .2nd, .., 8th), and by topic (arithmetic, geometry, pre-algebra, etc.) It has a nice interactive interface, practice questions and levels. A student can have a personalized dashboard. They've now branched out to Economics and AP-Biology ...


2

Beast Academy is wonderful. It goes from a level 2 to a level 5, but those are higher than U.S. grade levels. Also, I have some of my favorite books listed at my blog.


2

Some additional ideas and links: Strategical thinking: https://en.wikipedia.org/wiki/D%C5%8Dbutsu_sh%C5%8Dgi Programming: https://www.turingtumble.com/ (Technically 8+ but the concept should be understandable for younger kids as well. Note: it involves small marbles so use caution whether it's appropriate to be used by a smaller child.) Any kind of ...


1

Re (1), you should lower your standards. As previously discussed, the population for Math55 in high school is tiny. (Add onto that the difficulty of finding them and it just makes little sense to try to develop this.) In addition, you really lack the math knowledge OR the practical pedagogical experience to develop Math55 for high school (even the time, ...


1

For (2), I'd suggest creating the lessons first as blog posts or youtube videos and then sharing them. I think the math reddit might be a good place, but I'm not active there. These can then in turn serve as advertisements for any active curricula you'd like to implement. For (3): Start with an overall structure of the course. Make a list of course-level ...


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