1,2,4,8,16
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The greatest common factor of 16 and 21 is 1. Therefore, 16/21 cannot be reduced and is already in its simplest form.
No, 16 is a multiple of 4. 4 is a factor of 16.
It can be and is. Since 16 is not a factor of 42, the GCF will have to be a factor of 16 that is less than 16.
16 is not a factor of 312.
16 = 252 is the only prime factor of 16