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Section 5 Linear Measure
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Text Symbol Multiplier
tera T 1 000 000 000 000
giga G 1 000 000 000
mega M 1 000 000
kilo k 1 000
hecto h 100
deca da 10
none none 1
deci d 0.1
centi c 0.01
milli m 0.001
micro μ 0.000 001
nano n 0.000 000 001
pico p 0.000 000 000 001
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Example 22-1
3 000 meters is written as 3 kilometers; 6/1 000 meters is written as 6 millimeters.
When the number is written with symbols, the symbol for the multiplier is written
as a prefi x to the symbol for the unit (m for meter).
Example 22-2
3 000 meters is written as 3 km; 6/1 000 meters is written 6 mm.
Reading a Metric Ruler
Metric rulers often have one edge graduated in millimeters and the other edge
graduated in half millimeters. The centimeters are generally marked on the ruler.
One inch is approximately 2.54 centimeters or 25.4 millimeters. Millimeters can be
counted from the nearest centimeter graduation, but do not mix multipliers. For
example, write 65 millimeters, not 6 centimeters and 5 millimeters.
1 2 3 4 5 6 7 8 9 10 0
cm
160 170 180 190 200 210 220 230 240 250 150
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