ProfSmudge
@profsmudge.bsky.social
School maths should be more than tables and algorithms. I try to write materials that show that. Dietmar Küchemann
December 29, 2025 at 5:30 PM
That took me a while to understand...
December 29, 2025 at 10:01 AM
That took me a while to understand...
This came to me in a dream. Oh well!
December 26, 2025 at 12:06 PM
This came to me in a dream. Oh well!
How come it costs €1.20 to send a card from Germany, but £3.20 to send one back?!
December 23, 2025 at 12:32 PM
How come it costs €1.20 to send a card from Germany, but £3.20 to send one back?!
Clusters of mistletoe have suddenly appeared on our apple tree...
December 22, 2025 at 10:51 AM
Clusters of mistletoe have suddenly appeared on our apple tree...
#MathsToday Used this task with a group of Y10 students. They struggled to view the task structurally, even when their arithmetic produced the result 241.
But they gained some insight with 7x12 – 6x12.
But they gained some insight with 7x12 – 6x12.
December 18, 2025 at 2:36 PM
#MathsToday Used this task with a group of Y10 students. They struggled to view the task structurally, even when their arithmetic produced the result 241.
But they gained some insight with 7x12 – 6x12.
But they gained some insight with 7x12 – 6x12.
Just received my copy of MT 298, with my article on mathematical thinking
December 11, 2025 at 5:45 PM
Just received my copy of MT 298, with my article on mathematical thinking
#MathsToday Memories of Pythagoras
A Y11 pupil tells me he saw a video about Pythagoras' Theorem with diagrams like these:
A Y11 pupil tells me he saw a video about Pythagoras' Theorem with diagrams like these:
December 11, 2025 at 9:34 AM
#MathsToday Memories of Pythagoras
A Y11 pupil tells me he saw a video about Pythagoras' Theorem with diagrams like these:
A Y11 pupil tells me he saw a video about Pythagoras' Theorem with diagrams like these:
interesting thought? - as it rotates, what happens to the length of the segment through the centre of the pentagon that cuts the pentagon in two?
December 9, 2025 at 9:46 AM
interesting thought? - as it rotates, what happens to the length of the segment through the centre of the pentagon that cuts the pentagon in two?
Does this make sense?
If only 2% give , what use is a donation of £2.75?
If only 2% give , what use is a donation of £2.75?
December 7, 2025 at 7:59 PM
Does this make sense?
If only 2% give , what use is a donation of £2.75?
If only 2% give , what use is a donation of £2.75?
I don't think the fault lies with Bill Posters. All the rest seems to line up.
December 7, 2025 at 7:46 PM
I don't think the fault lies with Bill Posters. All the rest seems to line up.
Amazon-speak for
Package was left on doorstep
Package was left on doorstep
December 6, 2025 at 5:14 PM
Amazon-speak for
Package was left on doorstep
Package was left on doorstep
Think of ways to solve this
December 5, 2025 at 9:43 AM
Think of ways to solve this
In #MathsToday
Varying an expression and thinking about what happens to its value;
and when that didn't work, varying the expression to be varied....
Varying an expression and thinking about what happens to its value;
and when that didn't work, varying the expression to be varied....
December 4, 2025 at 12:23 PM
In #MathsToday
Varying an expression and thinking about what happens to its value;
and when that didn't work, varying the expression to be varied....
Varying an expression and thinking about what happens to its value;
and when that didn't work, varying the expression to be varied....
Can't help thinking of this. Our new song?!
[Might need to tweak the words a bit.]
www.youtube.com/watch?v=fJbx...
[Might need to tweak the words a bit.]
www.youtube.com/watch?v=fJbx...
"Ami, go home!" - German Anti-American Song
YouTube video by scryl
www.youtube.com
November 29, 2025 at 12:59 PM
Can't help thinking of this. Our new song?!
[Might need to tweak the words a bit.]
www.youtube.com/watch?v=fJbx...
[Might need to tweak the words a bit.]
www.youtube.com/watch?v=fJbx...
Opinions welcome!
November 29, 2025 at 12:47 PM
Opinions welcome!
What do we call the tax that you have to pay? Unfair tax?
November 20, 2025 at 12:47 PM
What do we call the tax that you have to pay? Unfair tax?
In #MathsToday yesterday, a Y11 student wondered whether y = 4x + 14 would be the equation of a line parallel to the line with equation y = 2x + 7.
[Where might that have come from? Could one class it as an 'intuition'?]
[Where might that have come from? Could one class it as an 'intuition'?]
November 20, 2025 at 12:05 PM
In #MathsToday yesterday, a Y11 student wondered whether y = 4x + 14 would be the equation of a line parallel to the line with equation y = 2x + 7.
[Where might that have come from? Could one class it as an 'intuition'?]
[Where might that have come from? Could one class it as an 'intuition'?]
I've just had a glance at Twitter, after many months' abstinence. Wow it is nasty, but why have so few maths ed people come (and stayed) on BlueSky?
November 19, 2025 at 4:06 PM
I've just had a glance at Twitter, after many months' abstinence. Wow it is nasty, but why have so few maths ed people come (and stayed) on BlueSky?
Which is larger, 900,000 or 60,000?
When it comes to immigration, it seems to be the second number.
When it comes to immigration, it seems to be the second number.
November 18, 2025 at 10:19 AM
Which is larger, 900,000 or 60,000?
When it comes to immigration, it seems to be the second number.
When it comes to immigration, it seems to be the second number.
- but I think you would need a more challenging question than that, to make a convincing case for the power of ratio tables!
November 18, 2025 at 10:17 AM
- but I think you would need a more challenging question than that, to make a convincing case for the power of ratio tables!
- and what was so horrible about last night's #Newsnight is that they didn't provide space for the presenter or guests to pick up on all the crude claims and disinformation coming from the Reform representative
November 18, 2025 at 10:10 AM
- and what was so horrible about last night's #Newsnight is that they didn't provide space for the presenter or guests to pick up on all the crude claims and disinformation coming from the Reform representative