Question

15 and 25,Find the LCM of the given number by prime factorisation method.

Answer 1

5|15,25
3|3,5
5|1,5
1|1,1

LCM will be 5×3×5=75

Answer 2

Solution :

Given numbers are 15 , 25.

Finding LCM by Prime factorisation method:

15 = 3 × 5

25 = 5 × 5 = 5²

LCM = 3¹ × 5²

[ Product of Highest powers of the

prime factors ]

= 3 × 25

= 75

Therefore ,

LCM ( 15 , 25 ) = 75

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