Answer: GCF is 3, LCM is 60
Step-by-step explanation:
For GCF The factors of 12 are 1, 2, 3, 4, 6, 12. The factors of 15 are 1, 3, 5, 15 which means the highest factor that goes into both of them is 3. How you find the LCM is you have to find the numbers they both go into! Hope this helps