Assessment: find the greatest common factor (GCF) of the given pair of numbers using any of the following methods: listing, prime factorization and continuous division. use a separate sheet of paper.

1. 16 and 24
2.10 and 30
3. 14 and 28
4 .20 and 40
5. 9 and 18
6. 10 and 50
7. 25 and 75
8. 12 and 48
9.18 and 72
10.50 and 100