Why is it important to measure accurately?

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Why is it important tomeasure accurately?
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Measuring in English(American Standard System)

• Using a Ruler

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Where did it come from?
Why 12 inches?
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The Kings Foot
One Foot
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The Kings Foot
One Foot
Too big for some things...
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...So they used the length of the Kings first
knuckle
One Inch
But that was too big for some other things...
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Why 12 inches not 10 or 13?
Simply because it took 12 lengths of his first
knuckle to equal his foot.
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...So they cut the inches into fractions
1/2
1/4
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...So they cut the inches into fractions
1/2
1/4
1/8
and 1/16
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The Ruler Game

• http//www.rsinnovative.com/rulergame/index.html