(13)

6000 mg

(14)

600 mg

(15)

0.15 grams

(16)

0.015 grams

(17)

2.4 grams

(18)

0.05 grams

(19)

(a) 0.015 grams

(b) 0.15 ml

The most commonly used system of weights and measures in pharmacy is the

metric system. The metric line on the prescription indicates the importance of this

system. A thorough understanding of the metric system is needed to perform

calculations in the pharmacy.

a. The three basic units of the metric system are the meter, the gram, and the

liter. The names of the other units are formed by adding a prefix to one of the basic

units. Each prefix has a numerical value as indicated below:

PREFIX

VALUE

micro - (mc) =

1/1,000,000

milli -

(m)

=

1/1,000

centi - (c)

=

1/100 times the basic unit.

deci - (d)

=

1/10

deka - (dk) =

10

hecto - (h)

=

100 times the basic unit.

Kilo - (k)

=

1000

MD0802

1-45

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