23
35
28
The numbers at the vertices add up to the numbers
in the rectangles between them.
What number does each question mark represent?
Topics: Starter  Algebra  Arithmetic  Puzzles
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The numbers at the vertices are 8, 15 and 20.
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.
Teacher, do your students have
access to computers? 

Here is the URL for a concise version of this page without comments or answers.
Transum.org/go/?Start=August20
Here is the URL which will take them to a student version of this activity with many different levels of difficulty.
Transum.org/go/?to=Arithmagons