Factors and Multiples - JSS2 Mathematics Past Questions and Answers - page 1

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.

The prime factorization of 15 is 3×5

The prime factorization of 25 is 5x5 .

The HCF is 5

So, HCF(15, 25) = 5.

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.

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.