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Add: 1/-18 "And" 5/-27 - Mathematics

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Question

Add: `1/-18  "and"  5/-27`

Sum

Solution

`1/-18  "and"  5/-27 = (-1)/18 + (-5)/27`

 

`= (- 1 xx 3)/(18 xx 3) + (- 5 xx 2)/(27 xx 2)`  
(∵ L.C.M. of 18 and 27 = 54)

`= (- 3)/54 + (-10)/54`

`= ((- 3) + (-10))/54 = (- 3 - 10)/54 =(- 13)/54`

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Concept for Problem Solving Using Operations on Rational Numbers
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Chapter 2: Rational Numbers - Exercise 2 (C)

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Selina Concise Mathematics [English] Class 7 ICSE
Chapter 2 Rational Numbers
Exercise 2 (C) | Q 2.6
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