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1. Question 1.
Verify commutativity of addition of rational numbers for each of the following
pairs of rational numbers :
Solution:

7. Question 2.
Verify associativity of addition of rational numbers i.e., (A: + y) + z = x + (y + z),
when :

8. Solution:

11. Question 3.
Write the additive inverse of each of the following rational numbers :
Solution:

12. Question 4.
Write the negative (additive inverse) of each of the following :
Solution:

13. Question 5.
Using commutativity and associativity of addition of rational numbers, express
‘iach of the following as a rational number :
Solution:

15. Question 6.
Re-arrange suitably and find the sum in each of the following :

16. Solution: