Question

3. Find the LCM and HCF of the following integers by applying the prime factorisation
method. 12, 15 and 21​

Answer 1

12, 15 and 21

By Applying The Prime Factorisation

• 12=2×2×3
• 15=2×3×5
• 21=3×7

$\text{LCM= 2×2×3×5×7}$

$\tt ~~~~~~~= 420$

$\text{HCF= Product of smallest power of each common prime factor}$

$\tt~~~~~~~~= 3$

Answer 2

Answer:

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