Question

find the LCM by prime factorization method
1) 15,25
2) 21,35
3) 30,50,75

Answer 1

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1. 15= 5*3
25 = 5*5
LCM(15,25)=5*3*5=75
2. 21=3*7
35=5*7
LCM(21,35)=7*5*3=105

3. 30=5*3*2
75=5*5*3
50=5*5*2
LCM(30,75,50)=5*5*5*2*2*3*3=4400



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Answer 2

the LCM of the three question is 75, 105 and 4500