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Introductory Pharmacology - Fractions
Ann MacLeod, RN, BScN, MPH
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Objectives
Convert Roman Numerals to ArabicConvert Arabic to Roman NumeralsCompare the size of fractionsAdd and subtract fractionsDivide and Multiply fractionsReduce fractions to the lowest terms
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Roman Numerals1/2 ss1 I, id2 II ii3 III iii4 IV iv5 Vv6 VI vi7 VII vii8 VIII viii9 IX ix
10 X x11 XI xi15 XV xv20 XX xx30 XXX xxx50 L l100 C c
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Roman Numerals Cont’d
12 1/2 xiiss
26 xvi
32 xxxii
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Size of Fractions
Numerator top numberDenominator bottom numberthe closer the numerator is to the bottom
number the closer to 1 or the bigger it ise.g. 5/6 is greater than 3/6 = 1/2the larger the denominator with 1 as the
numerator the smaller the fractione.g. 1/100 is smaller than 1/50
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Least term
4/6 divide 2 into the top and bottom= 2/3 no other numbers will go into
both numerator and denominator
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Making a common denominator
1/5 + 2/3 (multiply the 2 denominators)
(cross multiply the numerators)
3/15 + 10/15
= 13/15
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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 25-24 is the numerator of fraction)
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