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Discussion Guide It took centuries to come up with a standard system of measurement. Explore obsolete units and those that have — at least somewhat — withstood the test of time.
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Grades K-5 Lesson Plan
Get out the rulers, and challenge students to calculate how your classroom measures up.
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Grades 6-8 Lesson Plan
What does it mean to go the distance when a foot can range from 10 to 27 inches?
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Grades 9-12 Lesson
Help students grasp their galactic address by shrinking the universe down to a manageable scale.
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Good Measures
An image of measuring tapes with a variety of units for use in classroom presentations
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Math Squared
A numerical puzzle to challenge students' mathematical thinking and reasoning skills
Puzzle PDF
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