15
25
22
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
How did you use this starter? Can you suggest
how teachers could present or develop this resource? Do you have any comments? It is always useful to receive
feedback and helps make this free resource even more useful for Maths teachers anywhere in the world.
Click here to enter your comments.
If you don't have the time to provide feedback we'd really appreciate it if you could give this page a score! We are constantly improving and adding to these starters so it would be really helpful to know which ones are most useful. Simply click on a button below:
Previous Day  This starter is for 20 August  Next Day
The numbers at the vertices are 6, 9 and 16.
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