9, 5, 48, 8, 45, 44, 52,
12, 50, 1, 33, 21, 41, 24,
2, 29, 22, 11, 31, 3, 51.
Most of the numbers in the list above can be added to another number in the list to give a sum of 53. Which numbers do not have a partner?
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.
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.
Note that you can click on a number to partially hide it. Click it again to show it. This is useful to eliminate all of the pairs to leave only the numbers with no partner showing. The pupil version of this activity is even more interactive. The link is lower down this page.
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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.