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Create a “Find Someone” list, with about 10 items, each containing a shape, number, or measurement. Can you find someone in the group with hair about 4 inches long? Someone wearing parallel lines?

free Ages 6 - 14 10 to 30 minutes
Source Institutions
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This activity puts a mathematical twist on the familiar “guessing jar.” No guesses allowed, estimates only.

1 cent - $1 per group Ages 4 - 14 5 to 10 minutes
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Even fast computers are limited to how quickly they can solve problems. One way to speed things up is to use several computers at once.

$1 - $5 per group Ages 8 - 14 45 to 60 minutes