Find the GCF of the following numbers.
1) 32 and 36
2) 27 and 42
3) 54 and 60
4) 18 and 42
5) 45 and 50
6) 21 and 54
7) 24 and 48
8) 55 and 100
9) 72 and 81
10) 36 and 48​