NCERT Class 6 Maths Chapter 3 Playing With Numbers Exercise 3.1

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:

(a) 1, 2, 3, 4, 6, 8, 12, 24
b) 1, 3, 5, 15
c) 1, 3, 7, 21
d) 1, 3, 9, 27
e) 1, 2, 3, 4, 6, 12
f) 1, 2, 4, 5, 10, 20
g) 1, 2, 3, 6, 9, 18
h) 1, 23
i) 1, 2, 3, 4, 6, 9, 12, 18, 362

Question 2: Write first five multiples of :
a) 5
b) 8
c) 9
Answer:

a) 5 - 5, 10, 15, 20, 25
b) 8 - 8, 16, 24, 32, 40
c) 9 - 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) 25                            (e) Factor of 50
                                      (f) Factor of 20
Answer:

(i) 35 - (b) Multiple of 7
(ii) 15 - (d) Factor of 30
(iii) 16 - (a) Multiple of 8
(iv) 20 - (f) Factor of 20
(v) 25 - (e) Factor of 50

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

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