Download - Introductory Pharmacology - Fractions
Introductory Pharmacology - Fractions
Ann MacLeod, RN, BScN, MPH
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
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
Roman Numerals Cont’d
12 1/2 xiiss
26 xvi
32 xxxii
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
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 25-24 is the numerator of fraction)