InThinking Subject Sites
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Forthcoming Workshops
Mathematics: Analysis & Approaches
IBDP Category 2
Barcelona, Spain
7 to 9 February 2020
more info
Mathematics: Applications & Interpretation
IBDP Category 2
Barcelona, Spain
7 to 9 February 2020
more info
Mathematics: Applications & Interpretation
IBDP Category 1
Barcelona, Spain
4 to 6 September 2020
more info
Find all InThinking Workshops at www.inthinking.net
Site Author
Quote 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
Textbooks for Mathematics HL and Mathematics SL
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
Recommendationsmore
I highly recommend any IB Mathematics teacher who is seeking expert guidance on how best to teach either Standard Level or Higher Level Mathematics in today's classroom to subscribe to the InThinking website. It is an invaluable resource for both...
Tim's InThinking site has been invaluable to me as a new IB teacher. Before starting any new syllabus item, I use the site to gain a better understanding of the types of problems that my students need to be able to solve. It has helped me to format...
Great site. Dense with great ideas and useful printable student material. It has added an extra dimension to my teaching and given me several successful plan B options. Well done Tim.
Blogsee all
400 Problems! PotD
14 November 2019
My growing set of problems for the ProblemoftheDay section of this site now contains a total of 400 problems (each with a worked solution)... more
new website ... it is coming
30 October 2019
I have put a few notices on this site over the past couple of months indicating that the new website for the new Analysis &... more
Subscriber comments

Q.7: (a) A(1,2,1) and B(0,2,2), so AB=(1,0,1). Goes thru origin (0,0,0), so vector equation is r=(0,0,0) + t(1,0,1); or just r=t(1,0,1) same process for parts (b) and (c). Hope this helps. cheers, Tim

Q.5: point P is (2,1,3) and point R is at (6,5,1). So, midpoint of PR is (4,2,2). Vector equation of line is (x,y,z)=(4,2,2) + t(5,3,1). So, midpoint (4,2,2) is on line; hence, bisector. Direction vector PR is (4,6,2). Dot product of (5,3,1)...

OK, one at a time. Q.3: gradient of vector in direction (2,1) is 1/2; so perpendicular gradient is +2. Then equation of line is y5=2(x(3)) which gives 2xy=11

Can you show the work for #3 5, and 7 on 1st worksheet please? thanks

Pleasure.

Hi Notsile, You are correct. Although it does not affect the answer or the working shown in my solution key  line L (as given in the question) is not parallel to plane P. The direction vector for line L should be (1, 1,  4), not (3, 1, ...

There is a mistake with Test1 HL question 6. The question is not possible to solve.

Can you send some papers for AASL for practice

Dear Tim Thanks for your response to my question. Making a realistic and workable unit planner is a challenging task by itself.

Hi Beena, Eventually I'd like to add some materials regarding the construction of unit plans  but I find this a 'tricky' area because there is a wide range of approaches in different schools to writing unit plans. The IB offers some unit plan...

Hakan, Thanks for finding this error. The correct answer to Q.8 in EXS_27(6) exercise set is approximately 1.29 (your answer). I've corrected the exercise set and uploaded it above (version 2). Thanks, Tim

Dear Tim, Is the answer of the question 8 x=1.29?I can't get x=1.75. Thanks Hakan