Question

The LCM of smallest two-digit composite number and smallest composite number is: 

a) 12 

b) 4 

c) 20 

d) 44

Answer 1

c) 20 

As we know, the smallest two-digit composite number is 10 and the smallest composite number is 4.

By prime factorisation, we get;

4 = 1 × 2 × 210 = 1 × 2 × 5

Now, LCM of 4,10 = 2 × 2 × 5 = 20

Therefore, the LCM of the smallest two-digit composite number and the smallest composite number is 20.