@MathsEdIdeas

Maths Teacher • School Leader • FCCT • FRSA • NPQH • Sharing ideas, curios, problems & resources to inspire the teaching and ignite the learning of mathematics.

 London, UK
mathsedideas.blogspot.co.uk/
Joined June 2017
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A Friedman number is a number that can be written in a nontrivial way using its digits and the operations + − × ÷ ^ and concatenation. ‘Nice’ Friedman numbers have their digits in proper order. The only known 'nice' penholodigital Friedman number is: erich-friedman.github.io/mat…
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The only known 'nice' penholodigital Friedman number… 268435179 = -268+4^(3×5−1^7)-9

ALT The only known 'nice' penholodigital Friedman number… 268435179 = -268+4^(3×5−1^7)-9

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There are 88 narcissistic numbers, from 153 = 1³ + 5³ + 3³, to 115,132,219,018,763,992,565,095,597,973,971,522,401 = 1³⁹ + 1³⁹ + 5³⁹ + 1³⁹ + 3³⁹ + 2³⁹ + ... + 2³⁹ + 2³⁹ + 4³⁹ + 0³⁹ + 1³⁹ but other than 1, there is only 1 Münchhausen number bit.ly/2LZkIk5:
The Münchhausen number 3435 = 3³ + 4⁴ + 3³ + 5⁵

ALT The Münchhausen number 3435 = 3³ + 4⁴ + 3³ + 5⁵

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Planning for ‘stuckness’ in maths and ‘thinking through’ — rather than rigidly scripting — how we teach our students to get out of it: mathsedideas.blogspot.com/20…
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Daniel Muijs@ProfDanielMuijsOct 24
Why I don't believe in scripted approaches to teaching: On Direct Instruction and direct instruction, and why the distinction matters. danielmuijs.substack.com/p/d…
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Which square is larger? HT bit.ly/2Jfyhfm
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Today is the 24th day of 10th month of the 26th year of this century. 24² + 10² = 26² The last time most of us will witness a Pythagorean triple day.
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How many of these can you decode? For a collection of 150 mathsy ditloids — themed and ranging in difficulty, from easy number facts to events in maths history and fiendish curios to work out — free to download, with and without answers… tinyurl.com/mathsyditloids
Some examples of 'mathsy ditloids'... 2 is the O E P N... 6 is the S P N... 1, 2, 4, 6, 12, 24 are the F 6 H C N... 204 S on a C B... πr² is the A of a C...90 D in a R A... (n − 2)×180° is the S of the I A of a P... 5 S of a P... 4 is the G of y = 4x + 7... n(n + 1)/2 is the S of the F n N N... 2 T in a B... b² − 4ac is the D of a Q E... 7 B of K... 1687, I N's P P... 1729 the H–R (T) N... 6 is the T D of x³

ALT Some examples of 'mathsy ditloids'... 2 is the O E P N... 6 is the S P N... 1, 2, 4, 6, 12, 24 are the F 6 H C N... 204 S on a C B... πr² is the A of a C...90 D in a R A... (n − 2)×180° is the S of the I A of a P... 5 S of a P... 4 is the G of y = 4x + 7... n(n + 1)/2 is the S of the F n N N... 2 T in a B... b² − 4ac is the D of a Q E... 7 B of K... 1687, I N's P P... 1729 the H–R (T) N... 6 is the T D of x³

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Mathematicians are the Canary Down the AI Coalmine, @RestIsScience — A wonderful, fascinating listen/watch from two of the very best science communicators we are lucky to have @tweetsauce and @FryRsquared youtu.be/xuHOralyJao?si=ZLhb…

Mathematicians Are The Canary Down The AI Coal Mine

OpenAI claims a swarm of AI agents has solved the Navier-Stokes pro...

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There are II types of people in the world: those who like Roman numerals and those who don't. I, for one, like Roman numerals. I struggle until I get to 159, then it just CLIX, but IM LIVID that I can't remember how to write 1, 1000, 51, 6 and 500.
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What's the perimeter of this rectilinear shape? AI's thoughts: @ChatGPT got 2(8) + 2(6) = 28. @GeminiApp got 2 × (8 + 6) = 28. @grok got 28 + 6a and didn't go further. @claudeai 'measured the pixel coordinates' to get 34. @perplexity_ai got 28 + 6a = 28 + 6(1) = 34.
A irregular rectilinear polygon with a bounding width of 8 and a bounding height of 6. Relationships between some missing lengths are given.

ALT A irregular rectilinear polygon with a bounding width of 8 and a bounding height of 6. Relationships between some missing lengths are given.

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838931536741197143 is prime 8389315367411971 is prime 83893153674119 is prime 838931536741 is prime 8389315367 is prime 83893153 is prime 838931 is prime 8389 is prime 83 is prime …and the trailing double-digit numbers removed in each step are prime.
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Mathematics. Strange Universe. Right angles. What's the perimeter? Do we have sufficient info to solve this? Could AI solve this? By Maths Ed Ideas, @MathsEdIdeas, mathsedideas.blogspot.com, Used with permission.
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By the end of today, the 4! × 3! × 2! × 1! -th day of the year, exactly 6! × 5! × 4! × 3! × 2! × 1! seconds will have passed this year.
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String together the 9th prime (23) of 9s 8th prime (19) of 8s 7th prime (17) of 7s 6th prime (13) of 6s 5th prime (11) of 5s 4th prime (7) of 4s 3rd prime (5) of 3s 2nd prime (3) of 2s 1st prime (2) of 1s and you get the 100-digit pandigital prime ↓
The prime: 9,999,999,999,999,999,999,999,988,888,888,888,888,888,887,777,777,777,777,777,766,666,666,666,665,555,555,555,544,444,443,333,322,211

ALT The prime: 9,999,999,999,999,999,999,999,988,888,888,888,888,888,887,777,777,777,777,777,766,666,666,666,665,555,555,555,544,444,443,333,322,211

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Math. The Probability Trap. The Labyrinth of Decisions. Solving Life, One Path at a Time. By Maths Ed Ideas, @MathsEdIdeas, mathsedideas.blogspot.com/, Used with permission.
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Maths Ed retweeted
Alex Bellos@alexbellosSep 8
🍾 Zeeman, is me, man! 🍾 Incredibly honoured to receive the 2026 Christopher Zeeman Medal, the UK's top gong for maths communication. So proud for the recognition! Thanks @LondMathSoc and the IMA! ima.org.uk/29984/alex-bellos…
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42 mathsy activities, 42 days of school holidays ⇒ a daily dose of summer maths play. From games of Hex, Sprouts, and Misère Os and Xs (with just Xs), to Lewis Caroll's Amazing Number-Guessing game, fractals and Fibonacci on the beach, and much more: mathsedideas.blogspot.com/20…

42 Mathsy Things to do

Summertime Maths, Summertime Math, Maths for kids, Math for kids, Summer Maths, Summer Math, Maths Activities for kids, Math Activities for kids

mathsedideas.blogspot.com
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Math up your countdown to 2026. #HappyNewYear2026
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#Ramanujan was born #OTD 138 years ago. He created this, his birthday magic square, where all rows, columns, diagonals, corners, corners of 3×3 squares, and 2×2 corner and centre squares sum to the sum of the digits of his birthday in the 1st row. bit.ly/3Gd2K8M
Ramanujan’s birthday 4×4 magic square. 1st row: 22 12 18 87 2nd row: 88 17 09 25 3rd row: 10 24 89 16 4th row: 19 86 23 11

ALT Ramanujan’s birthday 4×4 magic square. 1st row: 22 12 18 87 2nd row: 88 17 09 25 3rd row: 10 24 89 16 4th row: 19 86 23 11

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Classic halloween maths…
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The 'First Equation'… a story about the evolution of the notation we use for addition (+), subtraction (–), and equality (=), which led to the first time an equation was written using the modern notation we use today, 14x + 15 = 71. mathsedideas.blogspot.com/20…

The First Equation

The 'First Equation' is a story about the evolution of the notation we use for addition (+), subtraction (–), and equality (=), whic...

mathsedideas.blogspot.com
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