Introduction
If you wanted to find out how many people live in your town, you could ask at the Town Hall, It is quite easy to count people, but how can we count fish in a pond? Here are some problems for you to think about and discuss.

A few years ago the number of blue whales in the oceans was thought to be less than 10000 and so catching blue whales was banned.

In the last few years governments have been arguing about how many cod and herring there are in the seas around Britain.

Whatever method we use to work out answers to these questions, we can never say that our answers are absolutely correct.

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