Question

Using prime factorizaion method find the lcm 21,28,36,45

Answer 1

21=21/3=7/7=1
lcm = 3×7
28=28/2=14/2=7/7=1
lcm=2×2×7
36=36/2=18/2=9/3=3/3=1
lcm=2×2×3×3
45=45/3=15/3=5/5=1
lcm=3×3×5

Answer 2

Answer:

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Step-by-step explanation:

by prime factorization:

21 = 3X7

28= 2X2X7

36= 2X2X3X3

45 = 3X3X5

now, HCF is the common one

therefore, HCF = 1 (as there are no common factor )

LCM =2X2X3X3X5X7  

        = 1260

HOPE IT HELPS YOU!!