Question

H.W.
CHAPTER-6
Be My Multiple, I'll be your Factor
Q1. Draw the factor tree for given
numbers:
i. 36
iv. 54
ii. 45
iii. 21
vi. 32
V. 20
Q2. Write all the numbers for following
hints:
a) Prime numbers less than 15
b) Composite numbers between 20 and 40
c) Even numbers more than 30 and less
than 45
d) Odd numbers greater than 45 and
smaller than 60
Q3. State True or False:
i) 2 is a composite number.
ii) There are 5 prime numbers between 15
and 35.
iii) 3 is the smallest prime number.​

Answer 1

(b) 15

15 = 1 x 15

15 = 3 x 5

Therefore, all the factors of 15 are: 1, 3, 5 and 15.

(c) 21

21 = 1 x 21

21 = 3 x 7

Therefore, all the factors of 21 are: 1, 3, 7 and 21.

(d) 27

27 = 1 x 27

27 = 3 x 9

Therefore, all the factors of 27 are: 1, 3, 9 and 27.

(e) 12

12 = 1 x 12

12 = 2 x 6

12 = 3 x 4

Therefore, all the factors of 12 are: 1, 2, 3, 4, 6 and 12.

(f) Factors of 20 are:

20 = 1 x 20

20 = 2 x 10

20 = 4 x 5

Therefore, all the factors of 20 are: 1, 2, 4, 5, 10 and 20.

(g) Factors of 18 are: