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An introduction to the importance of data organisation and tallying. Following a storm, Robinson Crusoe lands on an island. He wants to keep a record of how long he is on the island. Random recording of the days is not helpful so he starts to organise his data. He groups together neat sets of five marks, by way of tallying.

Students could build on the ideas in this clip by counting objects, people or animals using the tallying method. For example, if the students can see a road from their classroom, they could count the number of cars that pass. Alternatively, a story could be read to the students and every time a specific word is said, the students could mark a tally.