InThinking Subject Sites
Subscription websites for IB teachers & their classes
Taking learning to the next level
Disclaimer: InThinking subject sites are neither endorsed by nor connected with the International Baccalaureate Organisation.
Forthcoming Workshops
Crash Course: Mathematics Applications & Interpretation for New DP Teachers
Virtual ThinkIn, 17  18 June 2021
more info
Claves del Éxito: Evaluación Interna de Matemáticas en PD
Virtual ThinkIn, 28  29 June 2021
more info
Crash Course: Mathematics Applications & Interpretation for New DP Teachers
Virtual ThinkIn, 26  27 August 2021
more info
Claves del Éxito: Evaluación Interna de Matemáticas en PD
Virtual ThinkIn, 2  3 September 2021
more info
Mathematics: Analysis & Approaches
IB DP Category 1
Online (IB Approved)
3  5 September 2021
more info
Find all InThinking Workshops at www.inthinking.net
Tweets View all
 Jim Noble
@teachmaths 23 Mar 07:21RT @InThinker: INTHINKING VIRTUAL THINKIN Focus on: Maths & Approaches to Teaching & Learning 3 hours, 7 April. Book now: https://t.co/mB…  Jim Noble
@teachmaths 20 Mar 14:56  Jim Noble
@teachmaths 20 Mar 14:52Enjoying planning for this 3 hour 'Think in' about the broader goals of teaching mathematics classes. Especially t… https://t.co/OtuU033S8M  Jim Noble
@teachmaths 15 Mar 06:23RT @estelleash: My school has an opening for a PYP homeroom teacher. It really is a great place to work (@Simon_Gregg can concur) and Toulo…  Jim Noble
@teachmaths 14 Mar 08:09RT @ATMMathematics: Fantastic resource for teachers, Pattern Blocks by @Simon_Gregg Activities to address key areas of the curriculum, with…  Jim Noble
@teachmaths 10 Mar 12:33@DavidKButlerUoA You had me at quarter the cross!  Jim Noble
@teachmaths 05 Mar 18:28@TimHarford Just got them both!!!  Jim Noble
@teachmaths 01 Mar 16:30RT @InThinker: InThinking Virtual ThinkIns: online seminars for thoughtful educators  https://t.co/8wgELbgYCa Spread the word! https://t.…  Jim Noble
@teachmaths 27 Feb 07:25RT @panlepan: Here are 12 proofs without words given in the comments to show that the red kite represents a half of the octagon. Thanks eve…  Jim Noble
@teachmaths 28 Jan 20:41RT @DanielPearcy: Prompt 29: Angles in a Triangle Sum to 180 degrees I'm happy with my new method for this. After step 3 there's multiple…  Jim Noble
@teachmaths 01 Jan 21:04This is a good one to think about for a new year! https://t.co/aBLeg4GmPf  Jim Noble
@teachmaths 01 Jan 19:35So hard to make a good sphere but hours of fun trying! #snowballs https://t.co/262a5CSijP  Jim Noble
@teachmaths 01 Jan 19:20A pyramid of snowballs for the new year!!! https://t.co/seNrWbMQYw  Jim Noble
@teachmaths 11 Dec 16:57@mrbartonmaths Hell of an effort Craig. Well done and take care!  Jim Noble
@teachmaths 11 Dec 16:55RT @mrbartonmaths: Today my podcast is 5 years old  Jim Noble
@teachmaths 02 Dec 21:12https://t.co/SKgRPr5Lra this is too good for maths teachers!!!
School visits
If you are interested in Oliver Bowles, Jim Noble & Cornelia Noble visiting your school to work with teachers and/or students, please contact us.
Subscriber comments

Thank you Simon for the feedback  paper & markscheme now updated above.

For question 11a there seems to be an issue. The mark scheme seems to have x component of one of the vectors as zero when calculating the scalar product. Why would this be the case?

Is there an error with Q11a. The scalar product in the numerator of line 1 in the mark scheme seems to be incomplete?

Thanks! It works now.

Q6 b) I think that 32 is indicated as the answer in the markscheme. It is just not highlighted. See if you can find the solution right below the bolded 38.0617...

I believe it is because the 2kg quantity of Indium tin oxide is rounded to the nearest 0.01 kg. This means that the exact quantity of Indium is between 2.005 (upper bound) and 1.995 (lower bound). We find the upper and lower bound by adding...

Try now....

The 'solutions' for the examstyle questions require an access code/key.

Hi, Oliver. thank you for your work on producing this assessment. I have some questions: In Q5 b) you have in the table th evariables c and d for velocity in miles per hour and miles per second, since changing the units changes the values,...

Yes. That is correct. Can someone confirm that in Q5b the shortest distance between odd vertices is in fact 300 (ECB, AG)?

Hi, Q1 in part b i & ii, why do they add and subtract 5 to the maximum quantity? 2.005 & 1.995

Can someone confirm with me that Question #1 b ii, should be V=(1.2)x(1.875x+1.5) rather than V=(1.5)x(1.875x+1.5)? Interestingly enough working through dv/dx and finding the optimal value results in the same values for x and h.