Factors and Multiples - JSS2 Mathematics Past Questions and Answers - page 1
3
Which of the following is the LCM of 5 and 10?
A
5
B
10
C
15
D
20
correct option: b
Users' Answers & Comments6
Which of the following is the HCF of 14 and 35?
A
5
B
7
C
14
D
35
correct option: b
Users' Answers & Comments7
Find the LCM of 4 and 10.
The prime factorization of 4 is 2x2.
The prime factorization of 10 is 2x5.
The LCM is (2x2) × (5x1) =4×5=20.
So, LCM(4, 10) = 20.
8
Determine the HCF of 15 and 25.
The prime factorization of 15 is 3×5
The prime factorization of 25 is 5x5 .
The HCF is 5
So, HCF(15, 25) = 5.
9
Find the LCM of 7 and 9.
The prime factorization of 7 is 7.
The prime factorization of 9 is 3x3.
The LCM is (7x1)×(3x2)=7×9=63
So, LCM(7, 9) = 63.
10
Determine the HCF of 28 and 42.
The prime factorization of 28 is 2x2×7x1
The prime factorization of 42 is 2x1×3x1×7x1
The HCF is 2x1×7x1=2×7=14
So, HCF(28, 42) = 14.