Question

Find the LCM and HCF of 15, 18, 45 by the prime factorisation method.

Answer 1

Answer:

HCF(15,18,45)= 3

Step-by-step explanation:

We have ,

15 = 3¹×5¹

18 = 2×3×3 = 2¹×3²

45 = 3×3×5 = 3² × 5¹

HCF(15,18,45) = 3¹= 3

/* Product of the smallest power of each common prime factors of the numbers*/

Therefore,

HCF(15,18,45)= 3

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Answer 2

Answer:

HCF ( 15 , 18 , 45 )

Step-by-step explanation:

15 = 3 × 5 = 3 × 5

18 = 2 × 3 × 3 = 2 × 3²

45 = 3 × 3 × 5 = 3² × 5

3 is common in 15 , 18 and 45

So , the HCF is 3