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

  • 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.
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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:

Excellent, I would like to see more like this
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Didn't really capture the interest of the students
Not for me! I wouldn't use this type of activity.

This starter has scored a mean of 3.1 out of 5 based on 483 votes.


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

 

Answers

3.6 (to 1 dp) 2.2 (to 1 dp)
5.0 (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.



Casio Classwiz Calculator

There is currently a lot of talk about this new calculator being the best in its price range for use in the Maths classroom. The new ClassWiz features a high-resolution display making it easier to view numerical formulas and symbols but it isn't a graphical calculator as such (it has the capacity to draw graphs on your smart phone or tablet, via a scannable QR code and an app).

As well as basic spreadsheet mode and an equation solving feature you also get the ability to solve quadratic, cubic or quartic polynomial inequalities and the answer is given just as it should be written down, using the correct inequality symbols!

This calculator has a high-performance processor and twice the memory of previous models ensuring speedy operation and superior computational power.more...

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Laptops In Lessons

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).

Laptops In Lessons

Here a concise URL for a version of this page without the comments.

Transum.org/go/?Start=November4

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

Transum.org/go/?to=Pythagoras

Student Activity

 


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