Q1. Express each number as a product of its prime factors: (12)
(i) 144
(ii) 7429
(iii) 3825
(iv) 5005
(v) 156
(vi) 81
Q2. Find the LCM and HCF of the following integers by the prime factorisation method. (9)
(i) 12, 15 and 21
(ii) 17, 23 and 29
(iii) 8, 9 and 25
Q3. Prove that √5 is irrational (3)
Q4. Prove that 3+√2 is irrational (3)
Q5. Given that HCF (306, 657) = 9 ,
Find LCM (306, 657) (3)
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