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Evaluate: (-8)/9 + -5/12 - Mathematics

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Question

Evaluate:

`(-8)/9 + -5/12`

Sum

Solution

`(-8)/9 + -5/12`

2 9, 12
2 9, 6
3 9, 3
3 3, 1
  1, 1

LCM of 9, 12 = 2 x 2 x 3 x 3 = 36

`= (-8xx4)/(9xx4) - (5xx3)/(12xx3)`

`= (-32 -15)/36`   (LCM of 9 and 12 = 36)

`= (-47)/36`

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Chapter 1: Rational Numbers - Exercise 1 (A) [Page 9]

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Selina Concise Mathematics [English] Class 8 ICSE
Chapter 1 Rational Numbers
Exercise 1 (A) | Q 2.5 | Page 9
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