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20: 1, 2, 5, 10, 20 21: 1, 3, 7, 21
1,2,3,4,5,6,10,12,15,20,30,60
It is 7
273
6 numbers can go into 20; they are 1, 2, 4, 5, 10 and 20.
a+21
1 and 3
1 and 7
It is: 21
The GCF is 7.
The LCM is: 42
The GCF is 3.