Question

1. 15 and 20

GCF=  5  LCM=   60  

2.6 and 12

GCF=   6   LCM=   12  

3. 5 and 10

GCF=   5   LCM=   10  

4. 12 and 18

GCF=   6   LCM=   36  

5. 14 and 21

GCF=   7   LCM=   42  

​I hope it helps

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