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Through this nutrition activity (page 5 of the PDF), learners will understand—and probably be surprised by—how big serving sizes of various foods should be.

In this activity, learners will estimate how many seeds are in a fruit or vegetable, then count to find out. The result: mix estimation with healthy eating.

In this activity, learners investigate the concepts of relative size and distance by creating a basic model of the solar system.

In this activity (3rd on the page), learners investigate circadian rhythms by examining how well people do with estimating time.

In this online activity, learners will explore size estimation in one, two and three dimensions. Multiple levels of difficulty allow for progressive skill improvement.

In this activity, learners use two different techniques to estimate how many little things fit into one bigger thing.