Question

pls if Anyone has RD sharma book of class 8 maths send it's ch 1 pic​

Answer 1

Answer:

EXERCISE 1.1

1. Add the following rational numbers:

(i) -5/7 and 3/7

(ii) - 15/4 and 7/4

(iii) -8/11 and -4/11

(iv) 6/13 and -9/13

Solution:

PAGE NO: 1.5

Since the denominators are of same positive numbers we can add them directly

(i) -5/7 + 3/7 (-5+3)/7 = 2/7

(ii) - 15/4 + 7/4 = (-15+7)/4 = -8/4

Further dividing by 4 we get

-8/4 = -2

(iii) -8/11 + 4/11 = (-8+ (-4) 11 = (-8-4711 = -12/11

(iv) 6/13 + -9/13 = (6 +91369133 /13

2. Add the following rational numbers:

i) 3/4 and -5/8

Solution: The denominators are 4 and 8

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By taking LCM for 4 and 8 is 8

We rewrite the given fraction in order to get the same denominator

3/4 (3x2)/(4x2) 6/8 and

-5/8 = (-5x)/(x1) = -5/8

Since the denominators are same we can add them directly

6/8+-5/8 (6+(-5)8 (6-5)8 1/8

(ii) 5/-9 and 7/3

Solution: Firstly we need to convert the denominator to positive numbers.

51-9 = (5x-1)/(-9% -1) = 5/9

The denominators are 9 and 3

By taking LCM for 9 and 3 is 9

We rewrite the given fraction in order to get the same denominator

-5/9 = (-5x1)/(9x1) = -5/9 and

7/3 (7x3)/(3x3)= 21/9

Since the denominators are same we can add them directly

5/9 + 21/9 = (-5+21)/9 = 16/9

(iii) -3 and 3/5

Solution: The denominators are I and 5

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