21/9 6= 19/9 6/1= 19× 1/9 × 1 6 × 9/1 × 9 [L.C.M of 9 and 1 is 9] = 19/9 54/9= 19 54/9= 73/9= 81/9 ...

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Addition of Rational Numbers

v Find: -21/9...

Question

Question 2 (v)

Find:
$- 2 \frac{1}{9} - 6$

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Solution

$- 2 \frac{1}{9} - 6 = \frac{- 19}{9} - \frac{6}{1} = \frac{- 19 \times 1}{9 \times 1} - \frac{6 \times 9}{1 \times 9}$ [L.C.M of 9 and 1 is 9]
$= \frac{- 19}{9} - \frac{54}{9} = \frac{- 19 - 54}{9} = \frac{- 73}{9} = - 8 \frac{1}{9}$

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Question 6 (i)

Which of the following pairs represent the same rational numbers:
$\frac{- 7}{21} a n d \frac{3}{9}$

14, 6, 9, 15, 14, 9, 21, 21, 25, 21, 27, 29, 21, 8, 6,

15, 25, 14, 21, 9, 21, 25, 27, 29, 6, 14, 21, 21, 27, 25, 27, 9, 15, 14, 9

Question 2 (ii)

Find:
$\frac{5}{63} - (\frac{- 6}{21})$

- 2 \frac{1}{9} - 6

Class:	$3 - 6$	$6 - 9$	$9 - 12$	$12 - 15$	$15 - 18$	$18 - 21$	$21 - 24$
Frequency:	$2$	$5$	$10$	$23$	$21$	$12$	$3$

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