Page 1 - Sub-topic-6

Subject – Mathematics
Chapter 3 – FACTORS AND MULTIPLES
Sub-topic-6:- LCM(Lowest Common Multiple)
Practice Time:
SUBJECTIVE QUESTIONS:
1. Find the L.C.M of the following by prime factorization method.
(i) 6, 12

(ii) 15, 30
(iii) 16, 20

(iv) 54, 81
(v) 42, 49, 7

2. Find the L.C.M. of the following by factorization method.
(i) 16, 24

(ii) 48, 60
(iii) 15, 18, 30

3. Find the L.C.M. of the following by division method.
(i) 8, 16 and 36

(ii) 9, 18 and 27
(iii) 60, 80, 90
(iv) 25, 75, 95

OBJECTIVE QUESTIONS:

1. What is the least common multiple of the numbers 4 and 6?
a) 12
b) 15
c) 4
d) 6
2. Which option shows the first 3 common multiples of 3, 6 and 4?
a) 12, 24, 36
b) 12, 18, 24
c) 18, 24, 36
d) 12, 21, 24
3. The smallest number that is multiple of 2 or more numbers is called the______
a) Highest common factor (HCF)

b) Least common multiple (LCM)
c) Least common number (LCN)

d) Prime number
4. Which option shows the LCM of 12 and 18:
a) 24
b) 54
c) 90