RBSE Solutions for Class 6 Maths Chapter 3 Playing With Numbers Ex 3.1

Rajasthan Board RBSE Solutions for Class 6 Maths Chapter 3 Playing With Numbers Ex 3.1 Textbook Exercise Questions and Answers.

RBSE Class 6 Maths Solutions Chapter 3 Playing With Numbers Ex 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:
(a) 24 = 1 × 24 = 2 × 12 = 3 × 8
= 4 × 6 = 6 × 4 = 12 × 2 = 24 × 1
∴ Factors of 24 = 1, 2, 3, 4, 6, 8, 12, 24

(b) 15 = 1 × 15 = 3 × 5 = 5 × 3 = 15 × 1
∴ Factors of 15 = 1, 3, 5, 15

(c) 21 = 1 × 21 = 3 × 7 = 7 × 3 = 21 × 1
∴ Factors of 21 = 1, 3, 7, 21

(d) 27 = 1 × 27, 3 × 9, 9 × 3, 27 × 1
∴ Factors of 27 = 1, 3, 9, 27

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

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

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

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

(i) 36 = 1 × 36 = 2 × 18 = 3 × 12 = 4 × 9 = 6 × 6 = 9 × 4 = 12 × 3 = 18 × 2 = 36 × 1
∴ 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:
(a) 5 = 5 × 1 = 5, 5 × 2 = 10,
5 × 3 = 15, 5 × 4 = 20, 5 × 5 = 25
∴ First five multiples of 5 are 5, 10, 15, 20, 25.

(b) 8 = 8 × 1 = 8, 8 × 2 = 16, 8 × 3 = 24, 8 × 4 = 32, 8 × 5 = 40
∴ First five multiples of 8 are 8, 16, 24, 32, 40.

(c) 9 = 9 × 1 = 9, 9 × 2 = 18, 9 × 3 = 27, 9 × 4 = 36, 9 × 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:

Answer:

Question 4.
Find ail the multiples of 9 upto 100.
Answer:
9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99.