NCERT Class VIII Mathematics Chapter 1 Questions

1. Verify commutativity of addition of rational numbers for each of the following pairs of rational numbers:
(i) −115 and 47

(ii) 49 and 7−12

(iii) −35 and −2−15

(iv) 2−7 and 12−35

(v) 4 and −35

(vi) −4 and 4−7

 

2. Verify associativity of addition of rational numbers i.e., 

(x + y) + z = x + (y + z), when:

(i) x=12, y=23, z=−15

(ii) x=−25, y=43, z=−710
(iii) x=−711, y=2−5, z=−322
(iv) x=−2, y=35, z=−43

 

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

(i) −217

(ii) 3−11
(iii) −175
(iv) −11−25