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Compare the Cups

Age 5 to 7 Challenge Level:
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?

Photograph Acknowledgement
http://www.cupcompany.com/