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'Compare the Cups' printed from http://nrich.maths.org/
For this challenge, you will need lots of different cups. This picture shows some:
Which might you choose if you wanted a lot to drink? Why?
Which one would you choose if you did not want a lot to drink? Why?
Could you arrange the cups in a line from the one that holds the most liquid to the one that holds the least liquid?
How will you test whether you are right?