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Forthcoming Workshops
Mathematical studies SL
IBDP Category 1
Barcelona, Spain
6 to 8 October 2017
more info
Mathematics SL
IBDP Category 1
Barcelona, Spain
6 to 8 October 2017
more info
Mathematics HL
IBDP Category 2
Barcelona, Spain
6 to 8 October 2017
more info
Find all InThinking Workshops at www.inthinking.net
Site Author
Tim Garry is the site author and has taught mathematics from middle school to university since 1984 and been Head of Maths at three international schools. He's also been an IB examiner for external & internal assessment, contributor to IB curriculum reviews & Maths HL exam writing teams, delivered numerous workshops & coauthored IB maths textbooks (see below).
moreQuote of the day
Many who have had an opportunity of knowing any more about mathematics confuse it with arithmetic, and consider it an arid science. In reality, however, it is a science which requires a great amount of imagination.
(Sofia Kovalevskaya, 18501891)
Resources
Standard Level Mathematics
Textbooks for Math HL and Math SL. Two textbooks written by Tim Garry and Ibrahim Wazir that are fully revised 2nd editions providing comprehensive coverage for the new 2014 syllabuses. Each textbook comes with an ebook (accessed through a website) containing a complete digital copy of the text along with numerous additional material.
School visits
If you are interested in Tim Garry visiting your school to work with teachers and/or students, please contact us.
Home2Home
The vacation home exchange service for the IB community.
Feel at home when you travel the world.
www.home2homeinthinking.co.uk
Problem of the Day
Below you will find two growing sets of 'problems' (one for SL and another for HL) with one new 'problem' added nearly every day to each set. The idea behind the Problem of the Day is to offer students examlike questions that should involve some level of problem solving and the application of knowledge/skills in IB Maths SL and IB Maths HL. Certainly most of the SL 'problems'...
Recommendationsmore
I really like the continuously expanding InThinking Maths HL & SL resources. I always find something useful among the plentiful, practical, wellformatted resources  including notes, assignments, assessments, and interesting student pages. Absolutely...
I love the "accessible" to "discriminating" levelled questions. They are great for differentiation in the classroom  especially as time in the IB classroom is so precious. Students start work at their own comfort level, discuss in...
The InThinking Maths website is a very beneficial and userfriendly online guide for IB teachers. You can get an answer to all of your questions. There are all sort of materials and support, many samples of course designs, explorations, exams, teaching...
Blogmore
Challenge Problems (#10)
Sunday 10 April 2016
To me  and to most people who enjoy mathematics  solving a problem that requires insight, perseverance and creative use of mathematical knowledge... more
Measuring the earth's radius 1000 years ago
Tuesday 10 November 2015
This past weekend I was reading a review of a new history book, The Silk Roads by Oxford historian Peter Frankopan, in which the reviewer states... more
Perplexing Pentagons (Exploration Idea #499)
Sunday 13 September 2015
Recently, a Maths SL student asked for my thoughts about her writing an Exploration (IA) on tilings of the plane (Euclidean tessellations).... more
Subscriber comments

Sorry  hit "submit" before it was finished. This affects the probability that X is between 160 and 180  that should be 0.80. But then how can Prob (160 X 185) be 0.75?

Hi Tim  I think there might be an error in question 9, 2017, SL paper 2. If P(X

Cara, Oops  sorry about that. I've now uploade a new 'version 3' of the Solution Key for the P3 mock exam with answer (not really a worked solution) for Q.2(b).

Thank you for the Mock Exam, I see the solution to 2b is missing.

My grade 11 students also have "enjoyed" them  I choose the questions that address topics we've already covered  never too early to revise! Thanks, Tim!

Thank you for these problems! Myself and my SL class are loving them as part of our revision

Thank you, using the 9 problem sheet as review for upcoming test. All of this stuff really helps me a lot! :)

thank you!

Jill, Gosh ! what was I thinking. Apologies for my confused response and solution to SL POTD #26. When I looked at it again, I realize that my solution confused combinations with permutations. I've now fixed my solution  still different...

Hi Tim  Thanks but 20(1/216) and 5/9 aren't the same. So that's why we were confused. Jill

Hi Tim :) Thank you soooooo much for putting together these mock exam papers. And as you mentioned, I hope everyone who uses your mock exam papers would NOT share these online or with their students. Keep up the good work!

Jill, What your student has suggested is an alternative method of getting the same answer. Admittedly, probably a simpler method than the one I wrote  but both give the same correct answer, i.e. 5/9. Kudos to your student