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'Bottles (1)' printed from http://nrich.maths.org/
You need to find a collection of jars and bottles of different sizes and shapes, like those in the picture below:
I wonder which holds the most/least liquid?
Use estimation first of all.
How could you find out? Explore!
Can you find a way of counting how many "small container-fulls" each will hold?
Can you find a better way?