New #SlowRevealGraph
Nearly Half of all Brits with >100 Books Do Not Organize Their Collection
08.03.2026 04:16
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New #SlowRevealGraph
Nearly Half of all Brits with >100 Books Do Not Organize Their Collection
A horizontal box plot showing student estimations on a number line from 0 to over 500. The red box plot displays a minimum value of 71, a first quartile of 93, a median of 173, a third quartile of 270.5, and a maximum value of 520. A dashed blue vertical line marks the "Actual Value" at 350, showing that the majority of the box plot lies below the actual amount.
Students nailed the calculus but completely underestimated the pennies on their initial guess. According to our box plot, most of the class guessed less than half of the actual 350. Even with the wild estimates, it was great to see students engaged and genuinely having fun with the math.
I explored a bunch of different methods for finding the area of a triangle like this with the Math Club at school. classroom.amplify.com/activity/671...
It’s not always the most efficient method but I like to use the Shoelace Theorem when I have the chance just for fun.
A clear cup filled almost to the brim with copper pennies. The pennies are stacked randomly, making it difficult to count visually and prompting an estimation challenge.
A list of five calculus clues to find the total number of pennies. Clue 1: Upper Bound. The total is strictly less than g prime of 1, where g(x) = (10x^2)(5x^5 + 5). Clue 2: Lower Bound. The total is strictly greater than h prime of 0, where h(x) = (250x) / (2x + 1). Clue 3: Tens Digit. The tens digit equals k prime of 2, where k(x) = (7/4)(2x - 3)^2. Clue 4: Shared Factor. The total is a perfect multiple of f prime of 1, where f(x) = x^3 - (1/2)x^2 + 3x - 10. Clue 5: Hundreds Digit. The hundreds digit equals m prime of 0, where m(x) = (2x + 1)^3 / (3x + 1).
Bringing the classic "esti-mystery" to my Calculus class. Students make an initial guess of how many pennies are in the cup, then use derivative rules (power, product, quotient, chain) to narrow down possible values one clue at a time. #ITeachMath #MathsToday docs.google.com/presentation...
Our March Newsletter "The Counter" is out!
sites.google.com/oame.on.ca/n...
I haven't taught physics in a while but that looks really useful.
Pilot Kire-na highlighters in 5 colors.
Finding joy in simple things. These Pilot Kire-na highlighters are a new favourite. Highlighting student mistakes for feedback.
Derivative Concentration game. Match functions to their derivatives.
Delayed opening so I won't see my calculus class today. Used AI to code a Derivative Concentration game to play from home (match a function with its derivative). Just learning derivative rules so these are pretty basic. #ITeachMath @berniewestacott.bsky.social sites.google.com/gnspes.ca/ca...
Do you have a link to Craig’s post on this? I’d be interested in reading it too.
Rolling the rim of a Tim Horton’s coffee cup.
A Rim Roller
Roll up the Rim time at Tim Horton’s. Time to teach my son how to use the family rimroller.
Students investigate difference of powers formula.
The modified “Dead Puppy Theorem”
Gave a warm-up question to my Calculus students yesterday to guide them to the difference of powers formula. Realized half way through that I need to put up my sad puppy poster. No Binomial Theorem needed for this one. #ITeachMath #MathsToday
A grid of empty boxes with the headings: A is the point, B is the point,Midpoint of AB, Length of AB. Gradient of a parallel and perpendicular line. y-intercept, x intercept, equation of the line and sketch.
(Yet) another "Blank is Best" slide used in #MathsToday.
I made up the coordinates of A and B and Y10 had to try and fill the rest.
I used to pride myself on writing questions that assessed what we had talked about, but in new & different ways.
They'd get plenty of "the standard" questions, but I'd regularly mix in extension problems to see how they can apply their understanding.
This was a favorite
#mtbos
#iteachmath
Early dismissal today because of approaching weather. Used AI to shift my in class “scavenger hunt” activity to a virtual Google site activity for students to do at home. #ITeachMath @edtechcocek.bsky.social sites.google.com/gnspes.ca/ca...
Here is the link to the first unit's warm-up questions. I've been through these twice now and added/refined them a bit. docs.google.com/presentation...
Small Rhombicosidodecahedron if u even care.
I know it can be made with a single (incredibly long) modelling balloon because every vertex only has four lines coming from it, so it has an ✨Eulerian path✨
[New Post] Ontario Math Links - My favourite #math related links from this week:
ontariomath.blogspot.com/2026/02/math...
Links and help from @howiehua.bsky.social @theericklee.bsky.social @curiouspolymath.bsky.social @teacher2teacher.bsky.social #MathChat #MTBoS #iTeachMath
Students doing math.
Students doing math.
Nearly 100 students doing math on a Saturday morning! Teams of 4 from schools across Halifax competing this morning at the Nova Scotia High School Math League. #ITeachMath #MathsToday
A warmup question with four questions about slope and average rate of change.
A warm-up question with two different simplifying fractions questions. One "mild" and one "spicy" (a compound fraction).
Students sketch three different functions each is discontinuous at x = 1 but each has a different type of discontinuity.
A few warm-up questions from this week in my high school Calculus class. I start each day with a question. Sometimes for review/retrieval, sometimes to launch the day's discussion and sometimes for practice/consolidation. #ITeachMath #MathsToday
Triangle with the binomial coefficients, ending with the row that begins 1, 8, 28, ... In each row, the first term (1) is red. The second number (1, 2, 3, 4, ..., 8) is red. The remaining numbers are blue.
Can you guess what we're talking about in class recently?
🧮
Exponentials and logarithms revision practice grid. Contains eight exam-style questions to aid students with A-level Maths revision.
Line and circle geometry revision practice grid. Contains eight exam-style questions to aid students with A-level Maths revision.
Algebraic methods revision practice grid. Contains nine exam-style questions to aid students with A-level Maths revision.
Quadratics revision practice grid. Contains eight exam-style questions to aid students with A-level Maths revision.
I've added a new section to the site today - A-level Revision. Over the next few months I hope to add to the revision resources, starting with four A-level grids - algebraic methods, quadratics, exponentials and logs, and circle geometry.
www.draustinmaths.com/revision
#ALevelMaths #MathsToday
Examples of resources from gems post
New! My 196th gems post. Ideas, updates and resources for maths teachers. 💎
www.resourceaholic.com/2026/02/5-ma...
Hat tips to follow.
#mathstoday #ukmathschat #alevelmaths
[New Post] Ontario Math Links - My favourite #math related links from this week:
ontariomath.blogspot.com/2026/02/math...
Links and help from @colleenyoung.bsky.social @karencampe.bsky.social @alicekeeler.com @howiehua.bsky.social @johngolden.bsky.social and more
#MathChat #MTBoS #iTeachMath
✨ Computation Layer made simple!
Join this free webinar to learn how CL works behind the scenes in Amplify Classroom and how to use it in your own custom activities.
🗓️ Join us Feb. 23 at 7:30 p.m. ET: go.amplify.com/3K5FQVi.
The 2025 Desmos Art Contest gallery is now live 📣! Filter by feature and find your new favorite graph at desmos.com/art 🎨
#mathsky #iteachmath #mathart
The Mathematics of Origami by Joseph O’Rourke
I’m reading The Mathematics of Origami by @josephorourke.bsky.social. A great read with well explained math. We’ll be exploring some of these topics and open questions with our high school math club. #ITeachMath
My favourite method of solving this was to rotate the circle to simplify the problem. Not many students saw this way of thinking about the problem at first. www.desmos.com/calculator/k... #ITeachMath
A math problem. Find the red area given a cirlce and square.
Started the first day of Calculus class with a problem from @stevemaths.bsky.social. Students used several different strategies to calculate the red area. #ITeachMath
