"And" doesn't tell us anything about the arithmetic process you're suggesting,
so we're free to select one.
Addition and Multiplication don't do it.
The results are greater than 16:
16 + 42 = 58
16 x 42 = 672
But subtraction and division both do it.
The results are less than 16:
16 - 42 = -26
16 divided by 42 = 0.381 (rounded)
42 divided by 16 = 2.625
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yes... 16 is not a factor of 42 GCF is 2
Yes because it is 2
The only rule is that the GCF has to be equal to or less than the lower number. Since 16 is not the GCF of 16 and 42, the GCF has to be lower than 16.
It can be and is.
Yes.