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In this outdoor biology and math activity, learners estimate the size of a population of organisms too numerous to count.

This activity puts a mathematical twist on the familiar “guessing jar.” No guesses allowed, estimates only.

Learners make a counting/estimating jar to exchange with friends or bring home.

Learners make their own simple slide rules out of paper and learn how they work.

In this online activity, learners will brush up on their multiplication, division, and factoring skills with this exciting game.