All numbers are divisible by 1.
2- last digit should be 0,2,4,6,8.
3-the sum of the digits should be a multiple of 3
4- last 2 digits divisible by 4
5- last digit=0 or 5
6- divisible by 2 and 3
8-same as 4
9- same as 3
10- last digit 0
GCF=2
LCM=2520
