Yes, GCF means Greatest Common Factor
For example the GCF of 15 and 18 is 3 which is less than both 15 and 18.
No.
No.
No.
No.
The LCM is never less than the greatest number in the set. The LCM of 4 and 9 is 36.
No. The LCM of 4 and 6 is 12.
The LCM for any pair of natural numbers can be as big as their product.
How many numbers less than 700 are divisible by both 15 and 21?
I think so. -4 and -5 are both rational numbers. Their sum is -9, which is less than both of them individually.
They are both numbers less than 10
48 and 56
No, the product of two positive mixed numbers can never be less than one.