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Home » NCERT Solutions » Class 6 » Maths » Chapter 3 Playing with Numbers » Exercise 3.1

Exercise 3.1

Last Updated on July 3, 2023 By Mrs Shilpi Nagpal

Class 6 Mathematics Chapter 3 |
Playing with Numbers Exercise 3.1

Question 1:Write all the factors of the following numbers:
(a) 24 (b) 15 (c) 21 (d) 27 (e) 12 (f) 20 (g) 18 (h) 23 (i) 36

Answer 1:
(a) 24 = 1 x 24 = 2 x 12 = 3 x 8 = 4 x 6 = 6 x 4
Factors of 24 = 1, 2, 3, 4, 6, 12, 24

(b) 15 = 1 x 15 = 3 x 5 = 5 x 3
Factors of 15 = 1, 3, 5, 15

(c) 21 = 1 x 21 = 3 x 7 = 7 x 3
Factors of 21 = 1, 3, 7, 21

(d) 27 = 1 x 27 = 3 x 9 = 9 x 3
Factors of 27 = 1, 3, 9, 27

(e) 12 = 1 x 12 = 2 x 6 = 3 x 4 = 4 x 3
Factors of 12 = 1, 2, 3, 4, 6, 12

(f) 20 = 1 x 20 = 2 x 10 = 4 x 5 = 5 x 4
Factors of 20 = 1, 2, 4, 5, 10, 20

(g) 18 = 1 x 18 = 2 x 9 = 3 x 6
Factors of 18 = 1, 2, 3, 6, 9, 18

(h) 23 = 1 x 23
Factors of 23 = 1, 23

(i) 36 = 1 x 36 = 2 x 18 = 3 x 12 = 4 x 9 = 6 x 6
Factors of 36 = 1, 2, 3, 4, 6, 9, 12, 18, 36

Question 2: Write first five multiples of:

(a) 5  (b) 8  (c) 9

Answer 2: (a) 5 x 1 = 5

5 x 2 = 10

5 x 3 = 15,

5 x 4 = 20

5 x 5 = 25

First five multiples of 5 are 5, 10, 15, 20, 25

(b) 8 x 1 = 8

8 x 2 = 16

8 x 3 = 24

8 x 4 = 32

8 x 5 = 40

First five multiples of 8 are 8, 16, 24, 32, 40.

(c) 9 x 1 = 9

9 x 2 = 18

9 x 3 = 27

9 x 4 = 36

9 x 5 = 45

First five multiples of 9 are 9, 18, 27, 36, 45.

Question 3: Match the items in column 1 with the items in column 2

Column 1       Column 2

(i) 35          (a) Multiple of 8

(ii) 15         (b) Multiple of 7

(iii) 16        (c) Multiple of 70

(iv) 20        (d) Factor of 30

(v) 20          (e) Factor of 50

Answer 3: (i)  : (b)

(ii) : (d),

(iii) : (a)

(iv) : (f),

(v) : (e)

Question 4: Find all the multiples of 9 up to 100.

Answer 4: Multiples of 9 up to 100 are: 9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99

Filed Under: Chapter 3 Playing with Numbers, Class 6, Maths, NCERT Solutions Tagged With: Chapter 3, mathematics, NCERT Solutions, playing with numbers

About Mrs Shilpi Nagpal

Author of this website, Mrs. Shilpi Nagpal is MSc (Hons, Chemistry) and BSc (Hons, Chemistry) from Delhi University, B.Ed. (I. P. University) and has many years of experience in teaching. She has started this educational website with the mindset of spreading free education to everyone.

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