Ok let me #TryMathsLive with this from @mathforge.org …
Here's one that I had to double-check because I didn't believe the answer.
Consider a quadrilateral with corners at (0,0), (2,0), (a,b), and (0,2) where (a,b) is such that a, b > 0 and a + b > 2 (this is just to ensure it's convex).
What's its area, in terms of a and b?
#UKMathsChat #mathsky
Consider a quadrilateral with corners at (0,0), (2,0), (a,b), and (0,2) where (a,b) is such that a, b > 0 and a + b > 2 (this is just to ensure it's convex).
What's its area, in terms of a and b?
#UKMathsChat #mathsky
May 29, 2025 at 5:50 PM
Ok let me #TryMathsLive with this from @mathforge.org …
Time for a #TryMathsLive!
Without calculating, is 15.99/3.99 greater than 4, less than 4, or equal to 4?
February 2, 2026 at 2:24 AM
Time for a #TryMathsLive!
Ok let me #TryMathsLive with this puzzle from @catrionaagg.bsky.social …
What fraction of the triangle is shaded?
#geometrypuzzle
#geometrypuzzle
May 30, 2025 at 4:53 AM
Ok let me #TryMathsLive with this puzzle from @catrionaagg.bsky.social …
In the spirit of @davidkbutler.bsky.social, I shall #trymathslive with this problem.
(I'll even say "maths" instead of "math")
(I'll even say "maths" instead of "math")
December 5, 2024 at 8:17 PM
In the spirit of @davidkbutler.bsky.social, I shall #trymathslive with this problem.
(I'll even say "maths" instead of "math")
(I'll even say "maths" instead of "math")
I'm going to try that thing where you live-post through (hopefully) solving the problem. What's that called? #MathOutLoud? #RealTimeMath?
1/🧵
1/🧵
consider a subset of the first N positive integers:
S ⊆ {1, ..., N}
call S "mid" if, for every integer n, if n-1 and n+1 are elements of S, then n is in S.
#MathSky 🧮 #iTeachMath ♾️
example: if N=5, the set {2,3,4,5} is a mid subset.
⭐️ find a formula f(N) for the # of mid subsets of {1, ..., N} ⭐️
S ⊆ {1, ..., N}
call S "mid" if, for every integer n, if n-1 and n+1 are elements of S, then n is in S.
#MathSky 🧮 #iTeachMath ♾️
example: if N=5, the set {2,3,4,5} is a mid subset.
⭐️ find a formula f(N) for the # of mid subsets of {1, ..., N} ⭐️
November 23, 2025 at 4:37 PM
I don’t usually engage with things that don’t have alt text, but I am nerdsniped by this one. So I will #TryMathsLive on this problem from @ridermeister.bsky.social:
Rationalise the denominator of
1/(√2+√3+√5).
Rationalise the denominator of
1/(√2+√3+√5).
Another early question for new Year 12 FM pupils. This one is intended to show them that mathematics (at A-Level) doesn't really have 'hard' topics, we can make it all 'hard'!
#MathsToday #AlevelMaths #UKMathsChat
#MathsToday #AlevelMaths #UKMathsChat
September 16, 2026 at 8:13 PM
I don’t usually engage with things that don’t have alt text, but I am nerdsniped by this one. So I will #TryMathsLive on this problem from @ridermeister.bsky.social:
Rationalise the denominator of
1/(√2+√3+√5).
Rationalise the denominator of
1/(√2+√3+√5).
Today's Really Really Cool Thing: Seeing @davidkbutler.bsky.social #TryMathsLive and his "workshop presenting personality" in person 😁
July 17, 2026 at 7:03 AM
Today's Really Really Cool Thing: Seeing @davidkbutler.bsky.social #TryMathsLive and his "workshop presenting personality" in person 😁
Yo following @davidkbutler.bsky.social let's #trymathslive.
Without calculating, is 15.99/3.99 greater than 4, less than 4, or equal to 4?
February 2, 2026 at 2:41 AM
Yo following @davidkbutler.bsky.social let's #trymathslive.
Well, how about I #TryMathsLive on this problem?
trying to do this question:
"Using proof by induction, prove that x^(2n) - y^(2n) is divisible by (x+y)"
hitting a bit of a wall
#alevelmaths
"Using proof by induction, prove that x^(2n) - y^(2n) is divisible by (x+y)"
hitting a bit of a wall
#alevelmaths
February 28, 2026 at 9:17 PM
Well, how about I #TryMathsLive on this problem?
I shall #TryMathsLive with this from @unsolvedmre.bsky.social …
In how many ways can 2025 be written as a sum of two or more consecutive positive integers?
May 11, 2025 at 9:59 PM
I shall #TryMathsLive with this from @unsolvedmre.bsky.social …
I shall #TryMathsLive with this from @stevemaths.bsky.social, but not yet. Maybe in about 8 hours’ time.
(As usual I want no hints please. I want to do it myself.)
(As usual I want no hints please. I want to do it myself.)
Happy Friday 13th.
Here is today's #OCRMathsPuzzle
Arrange the first 16 prime numbers in the grid below (one per cell), so that the sum of each row and the sum of each column equal the given totals.
#MathsToday #UKMathsChat #RecreationalMath
#Arithmetic #PrimeNumbers
@cambridgeocr.bsky.social
Here is today's #OCRMathsPuzzle
Arrange the first 16 prime numbers in the grid below (one per cell), so that the sum of each row and the sum of each column equal the given totals.
#MathsToday #UKMathsChat #RecreationalMath
#Arithmetic #PrimeNumbers
@cambridgeocr.bsky.social
March 14, 2026 at 3:05 PM
I shall #TryMathsLive with this from @stevemaths.bsky.social, but not yet. Maybe in about 8 hours’ time.
(As usual I want no hints please. I want to do it myself.)
(As usual I want no hints please. I want to do it myself.)
I haven’t done #TryMathsLive in a while (too busy playing with two-sided ruler constructions), and this from @catrionaagg.bsky.social looks like a good opportunity.
July 8, 2026 at 8:17 PM
I haven’t done #TryMathsLive in a while (too busy playing with two-sided ruler constructions), and this from @catrionaagg.bsky.social looks like a good opportunity.
I’m going to #TryMathsLive with the extension problem that @howiehua.bsky.social asked in this video…
May 1, 2026 at 2:22 AM
I’m going to #TryMathsLive with the extension problem that @howiehua.bsky.social asked in this video…
Ok I really want to #TryMathsLive on this with Green’s Theorem. I have no idea what the kids in A-level maths learn for areas enclosed in parametric curves and I don’t care. I want to use Green’s Theorem.
#MathsToday #ALevelMaths
Here's this week's Monday area problem:
Find the exact value of the green area.
Here's this week's Monday area problem:
Find the exact value of the green area.
September 23, 2025 at 7:20 AM
Ok I really want to #TryMathsLive on this with Green’s Theorem. I have no idea what the kids in A-level maths learn for areas enclosed in parametric curves and I don’t care. I want to use Green’s Theorem.
#TryMathsLive is amazing, and more mathematicians and math educators should participate!
July 24, 2025 at 1:35 AM
#TryMathsLive is amazing, and more mathematicians and math educators should participate!
I’m going to #TryMathsLive with this one from @howiehua.bsky.social. Let’s see…
If it takes Elmo 1 1/2 minutes to build a snowman and Rocco takes 2 minutes to build a snowman, how fast can they build a snowman if they work together?
October 4, 2025 at 11:26 PM
I’m going to #TryMathsLive with this one from @howiehua.bsky.social. Let’s see…
I think I will #TryMathsLive on this problem from @catrionaagg.bsky.social
The two blue angles are equal. What’s the size of the orange angle?
March 29, 2026 at 7:38 PM
I think I will #TryMathsLive on this problem from @catrionaagg.bsky.social
I shall #TryMathsLive with this puzzle from @catrionaagg.bsky.social, but not straight away. Probably in about 15 hours' time on the train on the way to work, but you never know, it might be sooner.
November 24, 2024 at 5:06 AM
I shall #TryMathsLive with this puzzle from @catrionaagg.bsky.social, but not straight away. Probably in about 15 hours' time on the train on the way to work, but you never know, it might be sooner.
Hmm. I may #TryMathsLive with this problem that @unsolvedmre.bsky.social shared, but only after I've gotten another job done first. So maybe tomorrow morning on the way to work? But possibly even later. We'll see.
December 2, 2024 at 8:36 AM
Hmm. I may #TryMathsLive with this problem that @unsolvedmre.bsky.social shared, but only after I've gotten another job done first. So maybe tomorrow morning on the way to work? But possibly even later. We'll see.
Ok I want to #TryMathsLive with that last integral from @catrionaagg.bsky.social.
(As usual please don’t help me, even if I ask myself a question. I want to do it myself.)
(As usual please don’t help me, even if I ask myself a question. I want to do it myself.)
Y13 did their first set of integration looky-likeys in #MathsToday. Looking forward to lots more of this in the next few weeks!
The last one was a bit mean (I put it there to slow down the fast finishers) but they did manage it when I gave them the right substitution. #ALevelMaths
The last one was a bit mean (I put it there to slow down the fast finishers) but they did manage it when I gave them the right substitution. #ALevelMaths
October 20, 2025 at 9:26 PM
Ok I want to #TryMathsLive with that last integral from @catrionaagg.bsky.social.
(As usual please don’t help me, even if I ask myself a question. I want to do it myself.)
(As usual please don’t help me, even if I ask myself a question. I want to do it myself.)
@davidkbutler.bsky.social this seems like a perfect question for #trymathslive.
I'd do it myself, but I need to go to bed!
I'd do it myself, but I need to go to bed!
The sum of the terms in a particular arithmetic sequence is 75.
If you only sum EVERY OTHER term (starting at and ending on the same terms as before), you get 39.
What is the sum of EVERY THIRD term (again, starting at and ending on the same terms)?
#iTeachMath
If you only sum EVERY OTHER term (starting at and ending on the same terms as before), you get 39.
What is the sum of EVERY THIRD term (again, starting at and ending on the same terms)?
#iTeachMath
May 21, 2025 at 4:59 AM
@davidkbutler.bsky.social this seems like a perfect question for #trymathslive.
I'd do it myself, but I need to go to bed!
I'd do it myself, but I need to go to bed!
Ooh! Fun. I will do a #TryMathsLive on this from @unsolvedmre.bsky.social ...
Here's a fun Geometry quickie:
A particular polygon has only two distinct interior angle measures: 165° and 166°. How many sides does it have?
#iTeachMath
A particular polygon has only two distinct interior angle measures: 165° and 166°. How many sides does it have?
#iTeachMath
March 3, 2026 at 6:42 AM
Ooh! Fun. I will do a #TryMathsLive on this from @unsolvedmre.bsky.social ...
Well @segarrogers.bsky.social has put out the challenge, so I have to #TryMathsLive now…
An Ailles Rectangle problem. Find the value of a°.
More an exercise in (trigonometry) language fluency than anything else. i.e. do you know how to interpret the terminology to be able to do it in your head.
@davidkbutler.bsky.social
#UKMathsChat #iTeachMaths
More an exercise in (trigonometry) language fluency than anything else. i.e. do you know how to interpret the terminology to be able to do it in your head.
@davidkbutler.bsky.social
#UKMathsChat #iTeachMaths
June 5, 2025 at 8:10 PM
Well @segarrogers.bsky.social has put out the challenge, so I have to #TryMathsLive now…
Ooh interesting. I've never presented on the idea of #TryMathsLive before, and the various benefits of it with students.
April 22, 2026 at 7:57 AM
Ooh interesting. I've never presented on the idea of #TryMathsLive before, and the various benefits of it with students.