Find the GCF and the LCM of 18 and 20

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