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EstimationLine 2.0

The EstimationLine app is a proven estimation test for children to show where a target number should fall on a number line. It is fully configurable and saves the data to a CSV file for later analysis.

In this app, children touch the line with their finger to position their estimate. It is based on an experimental method originally introduced by Robert Siegler & John Opfer (2003) to examine numerical estimation. Many subsequent studies...