20
29
27
The numbers at the vertices add up to the numbers
in the rectangles between them.
What number does each question mark represent?
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Topics: Starter  Algebra  Arithmetic  Puzzles
Arithmagons starter from Transum. pic.twitter.com/4og2Nz6EI9
— Jenny Howard (@J3nnyHoward) March 16, 2016
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The numbers at the vertices are 9, 11 and 18.
Note to teacher: Doing this activity once with a class helps students develop strategies. It is only when they do this activity a second time that they will have the opportunity to practise those strategies. That is when the learning is consolidated. Click the button above to regenerate another version of this starter from random numbers.
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