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In this activity, learners will predict the size of a giant scale model of a comb or other rectangular object, then make one. If you tripled the size of a dollar bill, could you sit on it?

1 cent - $1 per group Ages 6 - 14 45 to 60 minutes
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Learners make their own simple slide rules out of paper and learn how they work.

1 cent - $1 per group Ages 8 - adult 10 to 30 minutes