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"Estimation is the process of finding an estimate, or approximation, of a result which is usable even if input data may be incomplete or uncertain."
Test your estimation skills
Try this interactive website to test your skills of estimation.
Another estimation quiz
Try to estimate the number of pearls in the chest, in this interactive quiz.
Estimation at Chessington World of Adventures
This video from the BBC includes some helpful hints on how to estimate distance, temperature, weight and time.
(Source of video: you tube)
This webpage from the Inquiry.net website includes useful information on making measurement estimates in nature.
You could use some of these ideas when making estimates in the bird park.
The information was originally created with Boy Scouts in mind.