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Mathematical Optical IllusionsDon't let your brain be fooled by these geometric optical illusions in this online quiz. |
What colour is the arc that passes through the centre of the black circle?
Midarc |
Trapezia |
Triangle |
Inequalities |
Dumbbells |
Check |
Take your time! Do not click the Check button until you are absolutely sure you have all the answers correct. You only get one chance!
Only after you have made a decision on all five illusions should you click the Check button. You can go back to each diagram as many times as you want by clicking on the tabs above. You can change your answers as many times as you want too.
The answers to this and other Transum puzzles, exercises and activities are available here when you are signed in to your Transum subscription account. If you do not yet have an account and you are a teacher, tutor or parent you can apply for one here.
A Transum subscription also gives you access to the 'Class Admin' student management system, downloadable worksheets many more teaching resources and opens up ad-free access to the Transum website for you and your pupils.
![]() You may also be interested in the data collecting activity called First Impressions. |
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More Activities: |
Mathematicians are not the people who find Maths easy; they are the people who enjoy how mystifying, puzzling and hard it is. Are you a mathematician? Comment recorded on the 7 April 'Starter of the Day' page by Marta, Rosea: "Hello! I wanted to comment that these starters always brighten my day. My students and I are very grateful to have access to these resources. Thank you!" Comment recorded on the 14 September 'Starter of the Day' page by Trish Bailey, Kingstone School: "This is a great memory aid which could be used for formulae or key facts etc - in any subject area. The PICTURE is such an aid to remembering where each number or group of numbers is - my pupils love it! |
Each month a newsletter is published containing details of the new additions to the Transum website and a new puzzle of the month. The newsletter is then duplicated as a podcast which is available on the major delivery networks. You can listen to the podcast while you are commuting, exercising or relaxing. Transum breaking news is available on Twitter @Transum and if that's not enough there is also a Transum Facebook page. |
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Numeracy"Numeracy is a proficiency which is developed mainly in Mathematics but also in other subjects. It is more than an ability to do basic arithmetic. It involves developing confidence and competence with numbers and measures. It requires understanding of the number system, a repertoire of mathematical techniques, and an inclination and ability to solve quantitative or spatial problems in a range of contexts. Numeracy also demands understanding of the ways in which data are gathered by counting and measuring, and presented in graphs, diagrams, charts and tables." Secondary National Strategy, Mathematics at key stage 3 |
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Go MathsLearning and understanding Mathematics, at every level, requires learner engagement. Mathematics is not a spectator sport. Sometimes traditional teaching fails to actively involve students. One way to address the problem is through the use of interactive activities and this web site provides many of those. The Go Maths page is an alphabetical list of free activities designed for students in Secondary/High school. Maths MapAre you looking for something specific? An exercise to supplement the topic you are studying at school at the moment perhaps. Navigate using our Maths Map to find exercises, puzzles and Maths lesson starters grouped by topic. | ||
Teachers | ||
If you found this activity useful don't forget to record it in your scheme of work or learning management system. The short URL, ready to be copied and pasted, is as follows: |
Alternatively, if you use Google Classroom, all you have to do is click on the green icon below in order to add this activity to one of your classes. |
It may be worth remembering that if Transum.org should go offline for whatever reason, there is a mirror site at Transum.info that contains most of the resources that are available here on Transum.org. When planning to use technology in your lesson always have a plan B! |
Do you have any comments? It is always useful to receive feedback and helps make this free resource even more useful for those learning Mathematics anywhere in the world. Click here to enter your comments. |
Steve Rosse,
Monday, February 13, 2023
"The Buddha says that what we see of the material world is an illusion, a shadow of reality brought to us by a mere five woefully inefficient senses. Cats see more than us, dogs smell more, bats hear more, snakes taste more. The universe that we cannot see, hear, feel, taste or touch is exponentially larger than the one we can.
Quote from Leaving Thailand - A Memoir by Steve Rosse."