How many sand grains are there on a beach?

New ELI today 'How many sand grains are there in a bucket – or on a beach? Planning activities to estimate the number of sand grains in a bucket – or on a beach'

This ELI is a planning exercise to estimate large numbers of very small items. There are at least two different ways of making this estimation, each with different routes, both involving some simple maths.

Other Earthlearningideas involving calculations can be found in 'Teaching strategies' on our website.