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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.

Q: Can the greatest common factor of 16 and 42 be less than 16 why?

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It can be and is.

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Yes, the GCF of any set of numbers must be less than or equal to the smallest member of the set. It cannot be greater. In this case, it is not 16 so it is less than 16.

When they have a common prime factor. When their GCF is greater than 1.

-14 = -1*1428 = 2*14Thus the GCF is 14. Do not be inclined to believe that the GCF is -14. Although -14 may be a common factor, it is less than 14, hence not the greatest common factor.

Related questions

Yes, the greatest common factor is less than or equal to the smallest coefficient. For example, the greatest common factor of 38 and 8 is 2.

Yes, the greatest common factor of 16 and 42 can be and is less than 16. The GCF of 16 and 42 is 2..

It can be and it is.

It can and is.

It isn't.

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It can be and is.

When they have a factor in common greater than one.

Since 16 is not a factor of 40, the GCF must be less than 16.

If we are trying to find the two numbers less than 50 with the greatest common factor, we need to pick two numbers with a larger difference between them, since the greatest common factor between two numbers cannot be greatest than the difference between the two numbers. To create a large difference, we will want one number to be close in value to 50. And, for the greatest common factor, we want the other number itself to be the greatest common factor. The greatest common factor that the larger number can have (since it is larger and thus cannot be the greatest common factor itself) is the number which is half its value. So, if we choose the even number closest in value to 50, we get 48. Then, if we take half of it, we get 24. The greatest common factor of 24 and 48 is 24. This is the largest possible greatest common factor of a pair of numbers less than 50.

254 cannot have a greatest common factor. To have a greatest common factor, there must be more than one number involved

No. In order for something to be a factor of a number, it has to be less than or equal to the number.