1. The product of two odd numbers is 35.
What are they?
2. The difference between two square numbers is 9.
What are they?
3. The sum of three prime numbers is 21.
What are they?
4. The ratio of two even numbers is 3:7.
What are they?
Tweet about this starter  Share 
Topics: Starter  Arithmetic  Number  Puzzles  Ratio
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 3.0 out of 5 based on 221 votes.
Previous Day  This starter is for 4 June  Next Day
1. 1 and 35 or 5 and 7 (and their negatives).
2. 16 and 25. Could there be any other solutions?
3. 2, 2 and 17 or 3, 5 and 13 or 3, 7 and 11 or 5, 5 and 11 or 7, 7 and 7.
4. 6 and 14 or 12 and 28 or 18 and 42 or ...
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 a button below to regenerate another version of this starter from random numbers.
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 related student activity.