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Best Answer
Start by factoring both numbers into primes:
210 = 2*3*5*7
450= 2*3*3*5*5
What's the shortest list that includes all the factors of both numbers?
One 2, two 3's, two 5's, one 7
That's the recipe for lcm in this problem.
lcm = 2*3*3*5*5*7
= 3150
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