I wish I knew, that would be very interesting. I'd be interested in the retention rates of maths vs other subjects.

Let the right one ln(x)

Almost certainly more likely in Scotland as the line for non-specialists is often drawn at BGE, whereas in England there's no hard line. For maths I imagine the percentage would be very high.

For names I use the children in the Edward Gorey alphabet poem. Amy, Basil, Clara, Desmond etc.
I like Don Stewards stuff because often the answers have repeats or patterns, which makes marking easy.

The sporting example is great. Ask any class: Player 1 takes 7 penalties and scores 6 of them, player 2 takes 8 penalties and scores 7 of them. Who's your pick? Or more extreme: 6/7 versus 99/100. Intuition is there. And an obvious link to statistics and sampling!

Yeah I saw this in a BBC article today. You always get this kind of factoid without any commentary. Nobody would seriously think that 10 days absence is the cause of such a dramatic reduction, yet often it seems presented that way.

The main objection I see is that having children write Valentine's cards in this way is very American. About as American as using the word "agendas."

258 + 4: they got 2, carried the one so got 5 +4 + 1 to get 10, so 0 carry 1. Then 2 + 4 + 1 = 7.
Basically they added 4 every time, so 444?
I'm guessing they worked without the column method, they worked sideways? Maybe abusing the equal sign?

Before teaching I would say "centimetres squared", now I always say "square centimetres." I want to emphasise the square as a shape, rather than as a little 2, in the minds of the students. I don't think the other way is wrong, it's just more algebraic than geometric in how it comes across.

A weird test gives you a quarter of a mark for each question. Martha scores half a mark, out of a maximum of 1 1/4 marks. Martha got 2 questions correct out of 5.

The project covers reading from charts, substitution into formulae, using ratio and metric conversion. I ran this with the main aim of giving S1 students something fun, with real life applications, that would boost confidence. Notes and resources: drive.google.com/file/d/1Ju8l...

Open intro!
www.openintro.org/data/
All real and have sources listed, and because they appear in a textbook they tend to need little to no tidying.

Yes, apparently the mobile apps treat +x% as an increase by that percent. Useful in a way, but should definitely come with a health warning.