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

$10 - $20 per group Ages 8 - 14 45 to 60 minutes
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In this activity, learners use measurement concepts to make models of what their body parts might look like if they were a snake or a chameleon.

$1 - $5 per student Ages 8 - 11 10 to 30 minutes
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In this classic memory game (on pages 37-45 of PDF), learners turn over tiles to reveal images on the back.

1 cent - $1 per group Ages 4 - 11 45 to 60 minutes
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In this activity, learners investigate the food, water, and space needs of common livestock animals.

free Ages 8 - 18 45 to 60 minutes