Red Lines

How long are the red lines?

Either estimate the lengths of the red lines or, if you know how, calculate how long they are.
The dots are one unit apart both vertically and horizontally.

Topics: Starter | Estimating | Pythagoras | Vectors

• Transum,
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• Estimation is such an important skill to practise and all too often it is not practiced often enough. There are other starters on this topic which can be found by following the estimating link above. Of course pupils who can apply Pythagoras' theorem will not need to estimate at all! Refresh the page to get different red lines.

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.

Previous Day | This starter is for 4 November | Next Day

 3.6 (to 1 dp) 4.1 (to 1 dp) 5.7 (to 1 dp) 4.2 (to 1 dp)

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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 Teacher, do your students have access to computers such as tablets, iPads or Laptops?  This page was really designed for projection on a whiteboard but if you really want the students to have access to it here is a concise URL for a version of this page without the comments: Transum.org/go/?Start=November4 However it would be better to assign one of the student interactive activities below.

Here is the URL which will take them to a related student activity.

Transum.org/go/?to=Pythagoras

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