Yes, 2 is a factor of 80. The factors of 80 are 1, 2, 4, 5, 8, 10, 16, 20, 40, and 80.
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The greatest common factor of 40 and 80 is 40. (Whenever one of a pair of number is a factor of the other larger number, it is the GCF of the two.)The greatest common factor (GCF) is often also called the greatest common divisor (GCD) or highest common factor (HCF). Keep in mind that these different terms all refer to the same thing: the largest integer which evenly divides two or more numbers.The GCF is: 4040
The number is 105.
Oh, dude, the greatest common factor of 50 and 80 is like the biggest number that can divide both of them evenly. So, you look at the factors of 50 (1, 2, 5, 10, 25, 50) and the factors of 80 (1, 2, 4, 8, 16, 40, 80) and the biggest number they have in common is 10. So, the greatest common factor of 50 and 80 is 10. Easy peasy, right?
The greatest factor of any positive number is the number itself.
When we say that a number varies by a factor of two from another number, it means that one number is twice the value of the other. Mathematically, if we have two numbers, A and B, and A varies by a factor of two from B, then A = 2B. This relationship indicates that A is double the value of B.