Chapter :-1 Real Numbers (वास्तविक संख्याएँ ) (महत्वपूर्ण प्रश्न ) class :- 10th 1. Find the LCM and HCF of 6 and 20 by the prime factorisation method. 2. Find the LCM and HCF of 96 and 404 using the prime factorisation method. 3.Find the LCM and HCF of 6 ,72 and 120 using the prime factorisation method. 4. Given that HCF (306 ,657) = 9 Find LCM (306,657). 5. Express each number as a product of is prime factors: (i)140 (ii)156 (iii)3825 (iv)5005 (v) 7429 6.Find the LCM and HCF of the following pairs of integers and verify that LCM × HCF = product of the two numbers . (i) 26 and 91 (ii) 510 and 92 (iii) 336 and 54 7...