prime factiozation

i am 25 years old and i need to the find the lcm of 15 years and 30 years

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  1. Multiples of 15: 15, 30, 45, 60

    Multiples of 30: 30, 60, 90

    Which is the smallest number in each group?

  2. Which is the smallest common number in the two groups?

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