Investigate the different shaped bracelets you could make from 18 different spherical beads. How do they compare if you use 24 beads?
Beat the Drum Beat!
Age 7 to 11 Challenge Level:
This problem follows on from We'll Bang the Drum so you may like to
try that one first if you haven't already.
Here are drums that can be placed on a wheel. As the wheel goes
round, each drum beats.
Before you read any further, explore the interactivity by making
some different rhythms.
In how many ways can you create a rhythm with a steady beat?
Explain how you have done this.
If there were 12 positions on the wheel, in how many ways would you
be able to create a steady beat? How do you know?
Now place just three drums on the wheel to create a new
What would happen if you played this rhythm backwards? Would it
Using three drums, make a rhythm which would sound the same
forwards as it does backwards.
How many different ways can you do this using just three
Now try creating rhythms which sound the same forwards and
backwards with four drums.
How about five drums?
How could you tell just by looking at the arrangement of drums
whether it would sound the same when the wheel rolled forwards or
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.