Solve the number puzzles drawn on the pavement of Trafalgar Square in London.
In London's Trafalgar Square a young man from Slovakia captures the interest of passers-by with puzzles he's drawn with chalk on the pavement.
Above the puzzles were the only instructions:
When I returned the following week all nine levels were ready for the keen puzzle solvers.
Can you explain how to find the missing number in each of the grids in the photograph above? The first few levels are quite easy but then it gets difficult. The answers are available lower down this page for subscribers (except the answer to level 8 which I'm still trying to figure out).
There are some easier 'Trafalgar Square' grids below for you to complete. They contain fixed rules but randomly-generated numbers. You can see how well you are doing by clicking the check button as often as you like as you work through the levels. If you get a level wrong try again:
Do you have any comments about this exercise? Can you do level 8 in the third photograph on this page? Do you enjoy working on the puzzles on the Transum website? Please let me know by entering a comment here.
The creators of the Trafalgar Square puzzles have made contact and kindly provided the photographs below:
This web site contains over a thousand free mathematical activities for teachers and pupils. Click here to go to the main page which links to all of the resources available.
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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 17 June 'Starter of the Day' page by Mr Hall, Light Hall School, Solihull:
Comment recorded on the 18 September 'Starter of the Day' page by Mrs. Peacock, Downe House School and Kennet School:
"My year 8's absolutely loved the "Separated Twins" starter. I set it as an optional piece of work for my year 11's over a weekend and one girl came up with 3 independant solutions."
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There are answers to this exercise but they are available in this space to teachers, tutors and parents who have logged in to their Transum subscription on this computer.
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Learning 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 main page links to more activities designed for students in upper Secondary/High school.
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Scan the QR code below to visit the online version of this activity.
Exam Style questions are in the style of GCSE or IB/A-level exam paper questions (worked solutions are available for Transum subscribers).
More on this topic including lesson Starters, visual aids, investigations and self-marking exercises.
You may also want to use a calculator to check your working. See Calculator Workout skill ##.
Don't wait until you have finished the exercise before you click on the 'Check' button. Click it often as you work through the questions to see if you are answering them correctly. You can double-click the 'Check' button to make it float at the bottom of your screen.