Eratosthenes

Here is an Aha! moment in the history of science when Eratosthenes proved Earth is not flat. These clips are from the astronomer & master science communicator Carl Sagan's Cosmos.

Factorisation is a term that sounds more complex than it actually is - and this lesson plan shows how you can make the concept accessible to young children who often struggle to understand the long strings of numbers that they see!

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