1.1 imperial units
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Unit 1.1 Imperial Measurements
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Measurement History
Before, people made their own measuring devices and units. These were usually based on body parts an object's relation to the forearm, etc.
Question what is wrong with this system? What could be done to fix it?
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1 mile = distance a Roman soldier could cover in 1000 paces
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Off the top of your head, what are some more Imperial Units?
Unit Abbreviation Referent Relationship
Inch
Foot
Yard
Mile
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Reading a Ruler
Inch ruler divided into inches.There are often subdivisions (in either 8ths, 10ths or 16ths).
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Converting Units
The best way to convert units is to use a method called UNIT ANALYSIS. It allows you to know for certain what units you are converting and what units you are ending up with.
For example, we can write the relationship between feet and inches as a fraction in two ways:
These fractions are called CONVERSION FACTORS.
Let's see how they work...
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Example 1
Convert 5 yd. to feet.
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Example 2.
Convert 12 in. to yards.
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Now you try!
Convert 8 yd. to...a. milesb. inches
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Example 3.
Anne is framing a picture. The perimeter of the framed picture will be 136 in.
a.) What will be the perimeter of the framed picture in feet and inches?
b.) The framing material is sold by the foot. It costs $1.89/ft. What will be the cost of the material before taxes?
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Example 4.
The school council has 6 yd. of fabric that will be cut into strips 5 in. wide to make decorative banners for the school dance. How many full banners can be made?
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Now you try!
A florist requires 9 in. of ribbon for each bouquet of flowers she creates. How many bouquets will she be able to create from 14 yd. of ribbon?