# Middle of Centres

## A Maths Starter of The Day

The blue point is exactly in the middle of two red points. What are their coordinates?

Which point is in the middle of the centres of enlargements?

The large red shape is an enlargement of the small red shape.
The large blue shape is an enlargement of the small blue shape.
[One small square represents one unit]

Teacher: Right click the diagram to zoom in.

Topics: Starter | Coordinates | Enlargements | Loci

• Set 1 (maths geeks), Ecclesbourne School
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• We really enjoyed this starter, thank you.
• Cathryn, China
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• It's a very good practice. Thank you.
• Maggie, Devon
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• Engaging starter, numbers on axes need to be bigger.

[Transum: Thanks for the suggestion Maggie. It has now been done.]
• Buthayna,
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• 'Thank you. I used my own set of axes, but thank you for the idea.'.
• C.O, London
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• This question does require a lot of brain work because the two points are far apart from the blue dot!

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.

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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.

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