Math Curmudgeon
@mathcurmudgeon.bsky.social
~40 years teaching HS math, physics & computer science. #iteachmath
He/Him/Sir/Mr. M
Alaxandr
Combat Archer, Northern Army
SCA: Society for Creative Aachronism
"Þæs ofereode, þisses swa mæg."
"That passed; this too shall pass."
He/Him/Sir/Mr. M
Alaxandr
Combat Archer, Northern Army
SCA: Society for Creative Aachronism
"Þæs ofereode, þisses swa mæg."
"That passed; this too shall pass."
details in alt text.
November 5, 2025 at 3:14 PM
details in alt text.
I like that we can do this with math and other subjects, even the headline!
November 5, 2025 at 3:06 PM
I like that we can do this with math and other subjects, even the headline!
Simple Fahrenheit to Centigrade conversions on a calculator.
Life should be more simple.
#Calculators
#PEMDAS
#GEDMAS
Life should be more simple.
#Calculators
#PEMDAS
#GEDMAS
September 20, 2025 at 1:32 AM
Simple Fahrenheit to Centigrade conversions on a calculator.
Life should be more simple.
#Calculators
#PEMDAS
#GEDMAS
Life should be more simple.
#Calculators
#PEMDAS
#GEDMAS
5000, epsilon<0.0001
Done for now.
285 14.8518109
4100 14.8519014
1777 28.5009300
4961 28.5010049
2075 57.7293104
4997 57.7293283
4703 175.8511277
2170 175.8511567
4848 296.0611490
828 296.0612136
4859 305.1067136
661 305.1068079
Done for now.
285 14.8518109
4100 14.8519014
1777 28.5009300
4961 28.5010049
2075 57.7293104
4997 57.7293283
4703 175.8511277
2170 175.8511567
4848 296.0611490
828 296.0612136
4859 305.1067136
661 305.1068079
May 17, 2025 at 9:17 PM
5000, epsilon<0.0001
Done for now.
285 14.8518109
4100 14.8519014
1777 28.5009300
4961 28.5010049
2075 57.7293104
4997 57.7293283
4703 175.8511277
2170 175.8511567
4848 296.0611490
828 296.0612136
4859 305.1067136
661 305.1068079
Done for now.
285 14.8518109
4100 14.8519014
1777 28.5009300
4961 28.5010049
2075 57.7293104
4997 57.7293283
4703 175.8511277
2170 175.8511567
4848 296.0611490
828 296.0612136
4859 305.1067136
661 305.1068079
413 48.43071
295 48.43082
732 99.16957
912 99.17009
156 232.95813
1191 232.95874
Nothing within 0.0001 up to the first 1500.
295 48.43082
732 99.16957
912 99.17009
156 232.95813
1191 232.95874
Nothing within 0.0001 up to the first 1500.
May 17, 2025 at 8:58 PM
413 48.43071
295 48.43082
732 99.16957
912 99.17009
156 232.95813
1191 232.95874
Nothing within 0.0001 up to the first 1500.
295 48.43082
732 99.16957
912 99.17009
156 232.95813
1191 232.95874
Nothing within 0.0001 up to the first 1500.
Up to the 1500th triangle and none are within 0.0001
413 48.43071
295 48.43082
732 99.16957
912 99.17009
156 232.95813
1191 232.95874
I'm beginning to think that, maybe, subtracting irrational numbers isn't going to be near 0.
413 48.43071
295 48.43082
732 99.16957
912 99.17009
156 232.95813
1191 232.95874
I'm beginning to think that, maybe, subtracting irrational numbers isn't going to be near 0.
May 17, 2025 at 8:57 PM
Up to the 1500th triangle and none are within 0.0001
413 48.43071
295 48.43082
732 99.16957
912 99.17009
156 232.95813
1191 232.95874
I'm beginning to think that, maybe, subtracting irrational numbers isn't going to be near 0.
413 48.43071
295 48.43082
732 99.16957
912 99.17009
156 232.95813
1191 232.95874
I'm beginning to think that, maybe, subtracting irrational numbers isn't going to be near 0.
Nerd-sniped myself this morning:
I found myself wondering if the hypotenuse of one of the triangles ever lined up *exactly* with the leg of another, and if so, which one?
I found myself wondering if the hypotenuse of one of the triangles ever lined up *exactly* with the leg of another, and if so, which one?
May 17, 2025 at 5:07 PM
Nerd-sniped myself this morning:
I found myself wondering if the hypotenuse of one of the triangles ever lined up *exactly* with the leg of another, and if so, which one?
I found myself wondering if the hypotenuse of one of the triangles ever lined up *exactly* with the leg of another, and if so, which one?
Rational Functions, factoring review, operations with algebraic fractions ... all wrapped up into one set of problems, with code-breaking. It's like butttaaah.
#algebra2
#mathstoday
#algebra2
#mathstoday
May 8, 2025 at 6:11 PM
Rational Functions, factoring review, operations with algebraic fractions ... all wrapped up into one set of problems, with code-breaking. It's like butttaaah.
#algebra2
#mathstoday
#algebra2
#mathstoday
#NewTeacherAdvice
Small whiteboards, cheap markers (~ $0.10 each) are well worth the math department investment.
Small whiteboards, cheap markers (~ $0.10 each) are well worth the math department investment.
May 5, 2025 at 9:17 PM
#NewTeacherAdvice
Small whiteboards, cheap markers (~ $0.10 each) are well worth the math department investment.
Small whiteboards, cheap markers (~ $0.10 each) are well worth the math department investment.
Anti-intellectualism is a feature of the population as a whole. Some of us are trying to fight that, but it can be exhausting when you are dealing with every type of person and student.
May 3, 2025 at 10:47 PM
Anti-intellectualism is a feature of the population as a whole. Some of us are trying to fight that, but it can be exhausting when you are dealing with every type of person and student.
#MTBoS #Iteachmath It's time for the occasional reminder of the day in 2021 when I did a Google Image search for "Math Icons". I was looking for images to use on a website menu ... symbols, math class cartoons, and such. Here's a partial screenshot.
IYKYK
IYKYK
April 9, 2025 at 1:51 PM
#MTBoS #Iteachmath It's time for the occasional reminder of the day in 2021 when I did a Google Image search for "Math Icons". I was looking for images to use on a website menu ... symbols, math class cartoons, and such. Here's a partial screenshot.
IYKYK
IYKYK
Something has changed about the decor in the White House but I just seem to put my finger on it … maybe there’s a bit more orange and gilt?
April 8, 2025 at 1:53 PM
Something has changed about the decor in the White House but I just seem to put my finger on it … maybe there’s a bit more orange and gilt?
If you’re going to criticize and/or ridicule the 86 yo president for typos, you should probably run spell check on your own article before publishing.
“allowed”
“allowed”
April 4, 2025 at 2:27 PM
If you’re going to criticize and/or ridicule the 86 yo president for typos, you should probably run spell check on your own article before publishing.
“allowed”
“allowed”
And you kids said there was never going to be a use for negative numbers in the real world!
March 29, 2025 at 6:50 PM
And you kids said there was never going to be a use for negative numbers in the real world!
If anyone is interested, here's a quick mock-up of how that might work ...
www.desmos.com/calculator/k...
www.desmos.com/calculator/k...
March 21, 2025 at 4:10 PM
If anyone is interested, here's a quick mock-up of how that might work ...
www.desmos.com/calculator/k...
www.desmos.com/calculator/k...
Love this visual of the proof of the angle sum theorems in Precalculus. I do it every year and it never fails to amaze.
Horizontally:
Green=yellow-pink
cos(A+B) = cosAcosB-sinAsinB
Vertically:
Yellow = green + pink
sin(A+B) = sinAcosB + sinBcosA
#iteachmath
#MathsToday
Horizontally:
Green=yellow-pink
cos(A+B) = cosAcosB-sinAsinB
Vertically:
Yellow = green + pink
sin(A+B) = sinAcosB + sinBcosA
#iteachmath
#MathsToday
March 14, 2025 at 9:57 PM
Love this visual of the proof of the angle sum theorems in Precalculus. I do it every year and it never fails to amaze.
Horizontally:
Green=yellow-pink
cos(A+B) = cosAcosB-sinAsinB
Vertically:
Yellow = green + pink
sin(A+B) = sinAcosB + sinBcosA
#iteachmath
#MathsToday
Horizontally:
Green=yellow-pink
cos(A+B) = cosAcosB-sinAsinB
Vertically:
Yellow = green + pink
sin(A+B) = sinAcosB + sinBcosA
#iteachmath
#MathsToday
*ALL* your life choices ...
February 19, 2025 at 8:29 PM
*ALL* your life choices ...
Fractions.
It's always fractions.
It's always fractions.
February 18, 2025 at 9:26 PM
Fractions.
It's always fractions.
It's always fractions.
In #mathstoday, the alg2s worked on The Problem.
February 18, 2025 at 9:20 PM
In #mathstoday, the alg2s worked on The Problem.
Kerning is important
February 13, 2025 at 9:11 PM
Kerning is important
In #MathsToday.
The box announces that Cologuard finds 92% of colon cancers. Later in the ad, we're told false positives can occur & this slide flashes on the screen.
If you receive a positive result, what are the chances that you do have colon cancer?
The box announces that Cologuard finds 92% of colon cancers. Later in the ad, we're told false positives can occur & this slide flashes on the screen.
If you receive a positive result, what are the chances that you do have colon cancer?
February 13, 2025 at 7:31 PM
In #MathsToday.
The box announces that Cologuard finds 92% of colon cancers. Later in the ad, we're told false positives can occur & this slide flashes on the screen.
If you receive a positive result, what are the chances that you do have colon cancer?
The box announces that Cologuard finds 92% of colon cancers. Later in the ad, we're told false positives can occur & this slide flashes on the screen.
If you receive a positive result, what are the chances that you do have colon cancer?
This is my favorite review activity for "Writing Equations of Lines"
February 13, 2025 at 7:23 PM
This is my favorite review activity for "Writing Equations of Lines"
Also, another parabola shows up when you track the vertex in y=ax^2 + bx + c when you vary b, but hold a,c constant.
February 12, 2025 at 10:52 PM
Also, another parabola shows up when you track the vertex in y=ax^2 + bx + c when you vary b, but hold a,c constant.
February 12, 2025 at 10:05 PM
Too traumatizing?
February 11, 2025 at 10:55 PM
Too traumatizing?