Estimate the lengths of these lines in centimetres.
Add your estimates together.
Hint: Your classroom door is probably two metres tall. How do the lines compare to that length?
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The answer will vary depending on how large your projector image is. Use a tape measure or ruler to measure the lines then add the results together. Who in the class got closest to the sum of your measurements?
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.
Teaching idea: Allow the pupils to work on this activity without any help. Once they have arrived at an answer, collect ideas from the class about strategies used then give the pupils a chance to re-estimate the lengths. As a point of reference, the classroom door is probably around 2m tall. Use a large ruler to find the correct lengths but stress that getting the answer exactly right was not expected.
Presentation Tip: Press the F11 key (except on MS Edge) to hide the tool bars if the lines don't fit on to your screen. You can also use the zoom option in your browser's menu to vary the display size.
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Texas Instruments Nspire Calculator
This handheld device and companion software are designed to generate opportunities for classroom exploration and to promote greater understanding of core concepts in the mathematics and science classroom. TI-Nspire technology has been developed through sound classroom research which shows that "linked multiple representation are crucial in development of conceptual understanding and it is feasible only through use of a technology such as TI-Nspire, which provides simultaneous, dynamically linked representations of graphs, equations, data, and verbal explanations, such that a change in one representation is immediately reflected in the others.
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Apple iPad Pro
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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 related student activity.
How many tins of paint are required to paint the Dome Café? Make some assumptions, do some research then estimate.