Question

1 Find the LCM by listing the multiples
a) 18, 15​

Answer 1

Answer:

LCM = 90

Step-by-step explanation:

i) Find the prime factorization of 15

15 = 3 × 5

ii) Find the prime factorization of 18

18 = 2 × 3 × 3

iii) Multiply each factor the greater number of times it occurs in steps i) or ii) above to find the LCM:

LCM = 2 × 3 × 3 × 5

LCM = 90

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Answer 2

The LCM of 15 and 18 is 90.