NCERT Exemplar Solutions
Class 6 - Mathematics - Unit 1: Number System - Problems and Solutions

Question 151

1. (i) The difference of two consecutive whole numbers → (d) 1

   Consecutive means “one after another”. Example: 4 and 5.

   \(5 - 4\)
   \(= 1\)

   Try any pair like 10 and 11:

   \(11 - 10\)
   \(= 1\)

   The difference is always 1.

2. (ii) The product of two non-zero consecutive whole numbers → (f) even

   Product means multiplication. Take 3 and 4:

   \(3 \times 4\)
   \(= 12\)

   One of two consecutive numbers is always even. Multiplying by an even number gives an even result. So the product is even.

3. (iii) Quotient when zero is divided by another non-zero whole number → (b) 0

   Dividing 0 by any non-zero number gives 0. Example:

   \(0 \div 5\)
   \(= 0\)

   So the quotient is 0.

4. (iv) 2 added three times, to the smallest whole number → (e) 6

   The smallest whole number is 0.

   \(0 + 2\)
   \(= 2\)
   \(2 + 2\)
   \(= 4\)
   \(4 + 2\)
   \(= 6\)

   So the result is 6.

5. (v) Smallest odd prime number → (c) 3

   Prime numbers have exactly two factors: 1 and the number itself.

   2 is the smallest prime, but it is even.

   The smallest odd prime is:

   \(3\)

   Factors of 3 are only 1 and 3.

Matched Pairs

(i) → (d) 1

(ii) → (f) even

(iii) → (b) 0

(iv) → (e) 6

(v) → (c) 3