Verify commutativity of addition of rational numbers for each of the following pairson of rational numbers:

(i) and

(ii) and

(iii) and

(iv) and

(v) 4 and

(vi) -4and

Verify associativity of addition of rational numbers i.e., when:

(i)

(ii)

(iii)

(iv)

Write the additive invese of each of the following rational numbers:

(i)

(ii)

(iii)

(iv)

Write the negative (additive inverse) of each of the following:

(i)

(ii)

(iii)

(iv)

(v) 0

(vi) 1

(vii) -1

Using commutativity and associativity of addition of rational numbers, express each of the following as a rational number:

(i)

(ii)

(iii)

(iv)

Re-arrange sutably and find the sum in each of the following.

(i)

(ii)

(iii)

(iv)

(v)

(vi)