Measurement - Length
Digital vs. Analog
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There are many other types of measuring
instruments that measure various other things.
Regardless of what you are measuring, the
instrument you are using may have either a
digital read-out or an analog read-out.
Digital read-outs are the simplest to read. The
measurement is given in numbers just the way
you need to record it.
Analog read-outs are in a form similar to that of
a ruler.
An indicator, such as a needle, points to the
correct measurement.
You must then determine the measurement by
reading the scale.
Length
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Length is how long an object is; and it is
measured in inches, feet, yards, and miles.
These are called English units of measurement.
There are also Metric units that include
millimeters, centimeters, meters, and kilometers.
Length
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Length is normally measured using a ruler or a tape
measure.
Half way between each inch mark is another large
mark that shows the half-inch.
There are three smaller marks between the inch and
half-inch mark that divide the inch into eighths.
The smallest marks of all divide the inch into
sixteenths.
Metric Ruler Measures
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The centimeter side is marked somewhat differently.
Each small mark is 1/10 cm = 0.1 cm = 1 mm
½ of a centimeter = 5 millimeters (mm).
Here are 10 mm = 1 cm. One-tenth is equal to 0.1.
5 cm + 4 mm = 5.4 cm or 54 mm.
The bright white mark on the ruler below is at 13.3 cm
or 133 mm.
Questions