NCERT Exemplar Solutions
Class 7 - Mathematics - Unit 1: Number System - Problems and Solutions
Question 117

Question. 117

117. Match the following

Column IColumn II
(a) \(a\times1\)(i) Additive inverse of \(a\)
(b) 1(ii) Additive identity
(c) \((−a)÷(−b)\)(iii) Multiplicative identity
(d) \(a\times(−1)\)(iv) \(a÷(−b)\)
(e) \(a\times0\)(v) \(a÷b\)
(f) \((−a)÷b\)(vi) \(a\)
(g) 0(vii) \(−a\)
(h) \(a÷(−a)\)(viii) 0
(i) \(−a\)(ix) −1

Answer:

(a) → (vi), (b) → (iii), (c) → (v), (d) → (vii), (e) → (viii), (f) → (iv), (g) → (ii), (h) → (ix), (i) → (i)

Detailed Answer with Explanation:

Use identities: \(a\times1=a\); 1 is multiplicative identity; 0 is additive identity; dividing by negatives changes sign; \(a÷(−a)=−1\) for \(a\neq0\); additive inverse of \(a\) is \(−a\).

NCERT Exemplar Solutions Class 7 – Mathematics – Unit 1: Number System – Problems and Solutions | Detailed Answers