Volume = 8 cm3
Volume = 1331 mm3
DIAGRAM NOT TO SCALE
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Hint: If you don't have a calculator with a cube root function here are the keys
you would need to press to find the cube root of 1331:
This works because raising a number to the power one third is equivalent to finding the cube root of the number.
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?
Here a concise URL for a version of this page without the comments.
Here is the URL which will take them to a self marking quiz about volume.
There is a simple method to compute the cube roots using a non-scientific calculator, which requires only the multiplication and square root buttons. No memory is required. The following method is used:
This process is continued until the number does not change when the multiplication button is pressed, since the repeated square root gives 1 (this means that the solution has been determined to as many significant digits as the calculator can handle). Then, press the square root button one last time. At this point an approximation of the cube root of the original number will be shown in the display.
A full explanation of why this works can be found onWikipedia, the free online encyclopedia.
See the National Curriculum page for links to related online activities and resources.