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  • 04-01-2019
  • Mathematics
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find the GCF and the LCM of 18 and 20

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tanarocks1022 tanarocks1022
  • 04-01-2019
GCF= 2
LCM=180

Step by step for GCF=
The prime factorization of 20 is 2,5
The prime factorization of 18 is 2,3
The common multiple they share is 2

Step by step for LCM=

the prime factorization of 18
18 = 2 × 3 × 3
the prime factorization of 20
20 = 2 × 2 × 5
Multiply each factor the greater number of times it occurs to find lcm

LCM = 2 × 2 × 3 × 3 × 5
LCM = 180
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