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400 Problems! PotD
My growing set of problems for the Problem-of-the-Day section of this site now contains a total of 400 problems (each with a worked solution) - 200 SL problems and 200 HL problems. This milestone comes...
new website ... it is coming
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Problem: find exact ratio of areas
Here is a problem that I thought up (probably has appeared somewhere before but I have not seen it) which is presented in the GeoGebra applet below. We are early in the school year (well, except for...
Probability - Complement Approach
Question: Two fair six-sided dice are rolled. What is the probability that at least one of the dice shows a five facing up? Three different solutions are given below. Let X be the random variable...
Worked Solutions - HL Paper 1 Exam
The May 2019 IB examination session is now finished. Teachers are eager to scrutinize an exam after it has been made available 24 hours after students have taken it. This usually leads to some interesting...
Euler's method on the TI-Nspire
As they say, a picture (or a video, in this case) is worth a thousand words. The video here shows one way to use the spreadsheet on the TI-Nspire to perform Euler's method to find the approximate solution...
what is path of midpoint of a falling ladder?
Something which I think that is often not emphasized or valued enough when teaching mathematics is encouraging students to visualize a graph, diagram, relationship between objects, motion of an object,...
Effective GDC Use #3
Concerning effective GDC use, I try to avoid giving my students the impression that mindlessly pushing buttons on a GDC will allow them to successfully answer an exam question. Although there may be exam...
P.o.t.D.- 301 problems
This is just a short entry to highlight the fact that I have now managed to compose more than 300 problems in my Problem of the Day (P.o.t.D.) lists - one list for an SL Problem of the Day, and another...