Introductory Pharmacology
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Transcript Introductory Pharmacology
Introductory Pharmacology
- Fractions
Ann MacLeod, RN, BScN, MPH
Objectives
Convert Roman Numerals to Arabic
Convert Arabic to Roman Numerals
Compare the size of fractions
Add and subtract fractions
Divide and Multiply fractions
Reduce fractions to the lowest terms
Roman Numerals
1/2
1
2
3
4
5
6
7
8
9
ss
I, id
II ii
III iii
IV iv
V
v
VI
vi
VII vii
VIII viii
IX
ix
10
11
15
20
30
50
100
X
XI
XV
XX
XXX
L
C
x
xi
xv
xx
xxx
l
c
Roman Numerals Cont’d
12 1/2
xiiss
26
xvi
32
xxxii
Size of Fractions
Numerator top number
Denominator bottom number
the closer the numerator is to the bottom
number the closer to 1 or the bigger it is
e.g. 5/6 is greater than 3/6 = 1/2
the larger the denominator with 1 as the
numerator the smaller the fraction
e.g. 1/100 is smaller than 1/50
Least term
4/6 divide 2 into the top and bottom
= 2/3 no other numbers will go into both
numerator and denominator
Making a common
denominator
1/5 + 2/3
(multiply the 2 denominators)
(cross multiply the numerators)
3/15 + 10/15
= 13/15
Common denominator for
mixed fractions
3 1/2 + 2 3/4
( multiply denominator by the whole
# then add the numerator)
7/2 + 11/4
( then make a common denominator)
= 14/4 + 11/4
= 25/4
= 6 1/4 (to revert to mixed fraction,divide the
denominator into the numerator and the difference 2524 is the numerator of fraction)