# 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.

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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.

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This starter has scored a mean of 3.0 out of 5 based on 761 votes.

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

 5.7 (to 1 dp) 3.6 (to 1 dp) 4.1 (to 1 dp) 3.2 (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?Do they have iPads or Laptops in Lessons? Whether your students each have a TabletPC, a Surface or a Mac, this activity lends itself to eLearning (Engaged Learning).

Transum.org/go/?Start=November4

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

Transum.org/go/?to=Pythagoras

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