Find the prime factorisation of the following numbers:

(i) 72

(ii) 172

(iii) 450

(iv) 980

(v) 8712

(vi) 13500

Write the smallest and the greatest 3-digit numbers and express them as the product of prime.

I am the smallest number, having four different prime factors. Can you find me?

Find the HCF of the given numbers by prime factorisation method:

(i) 28, 36

(ii) 54, 72, 90

(iii) 105, 140, 175