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

In this activity, learners will keep track of how much they can do in one minute. Instructors can pick something everyone will do for a minute, such as jumping up and down or drawing stars.

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.

Put the math of measurement, numbers, and everyday life into improvisational skits.

In this activity, learners will make cleaning up more fun with predictions and counting. Estimate how many things are on the floor (or table), then count as they are picked up.