Investigate the different shaped bracelets you could make from 18 different spherical beads. How do they compare if you use 24 beads?
Age 7 to 11 Challenge Level:
Take a look at this video, which has no sound:
If you can't access YouTube, here is a direct link to the video: SurprisingSplit.mp4
Click below if you would like to read a description of what happens in the video.
54 x 11 is written.
Below that, the 5 and 4 are written again but separated so that there is a gap between them. A curved line is drawn linking the 5 and 4 and an addition sign is written below it. The number 9 is written between the 5 and 4.
Below that, 594 = 54 x 11 is written.
What do you notice?
What would you like to ask?
You might want to watch the video again.
Can you re-create this trick for yourself for 54 x 11? Try the trick for a different multiple of 11. What happens?
Does the trick always work, for any multiple of 11?
This isn't really a trick, it's maths! Can you explain why it works?
Thank you to David Frankau and Mr Hadfield from the Pointer School in Greenwich who drew our attention to a trick for the 11 times table, which we have adapted for this task.
The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the
NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to
embed rich mathematical tasks into everyday classroom practice.