1
2
3
4
5
Tweet about this starter  Share 
Topics: Starter  Arithmetic  Investigations  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:
This starter has scored a mean of 3.6 out of 5 based on 300 votes.
Previous Day  This starter is for 3 June  Next Day
We found 24 different solutions. Are there any more?



Can you prove that the centre number has to be odd?
You may want to print out this page, cut out each answer and arrange them into groups. This may help you spot patterns.
Teacher, do your students have
access to computers? 

Here a concise URL for a version of this page without the comments.
Here is the URL which will take them to a student version of this activity with different levels of difficulty.