#maths (9 links)
- NRICH nrich.maths.org
Rich, engaging mathematical resources for ages 3 to 18, including research-informed teacher support. NRICH resources are free to use for teachers, students and parents, and open to all.
- Polypad polypad.amplify.com
Our mathematical playground is filled with unique tools that allow students to play and explore – and they’re completely free to use.
- RxC QV quadraticvote.radicalxchange.org
Quadratic Voting is the mathematically optimal way to vote in a democratic community. Vote through collective decision-making, by allocating votes that express the degree of your preferences, not just direction.
In the conventional survey, people tended to gravitate to one end of the scale or the other. They expressed strong approval or disapproval, just as online reviewers tend to give five stars or none. In both cases, a strong statement costs nothing. In the quadratic poll, people faced a constraint. Expressing vehemence on one issue required them to weaken their stand on another. This constraint forced them to be more discerning about their passions.
- Business Days Calculator – Count Workdays timeanddate.com
- Aspect Ratio Calculator (ARC) andrew.hedges.name
One goal of this was to figure out how much of the variance in score comes from the tile order and how much comes from the board, given that a tile order would be expected. It turns out to be about half-bag, half-board. [...] The blank is worth about 30 points to a good player. [...] The Q is a burden to whichever player receives it, effectively serving as a 5 point penalty.
Via kevan.
- Adactio: Journal—Re-finding five numbers adactio.com
Simon Singh’s Five Numbers radio series on huffduffer
Making Tables More Readable With Alternating Row Colors