Factors of 160 are 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160.
Factors of 200 are 1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 200.
Not counting 1, the common factors are 2, 4, 5, 8, 10, 20, 40.
[Note that 1 and the number itself are not usually counted as factors.]
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The common factors of 160 are the numbers that can evenly divide 160 without leaving a remainder. These factors include 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, and 160. The greatest common factor (GCF) of 160 is the largest number that divides 160 and another given number without leaving a remainder. In this case, since 160 is a multiple of 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, and 160, the greatest common factor of 160 with any other number would be 160.
Since 100 is a factor of 200, all of its factors are common.
To find the GCF of any set of numbers. Divide the numbers by their prime number factors, and see which is common to each number in the set. Hence 160,240 & 200. 160 = 2x2x2x2'x2'x5 200 = 2x2x2x5'x5 240 = 2x2x2x2'x3'x5 So each number has 2x2x2x5 (common to all three numbers) 2x2x2x5 = 40 The GCF. NB THe other factors are discrete to the given number. So for 200 the second '5' is discrete to 200 and so is not common to all the other numbers. I have written the discrete numbers as (2') etc.,
The prime factors of 160 are 2, 2, 2, 2, 2, and 5. The prime factors of 195 are 3, 5, and 13. The prime factors they have in common are a single 5, so 5 is the greatest common factor.
Factors of 189: 1,3,7,9,21,27,63,189 Factors of 200: 1,2,4,5,8,10,20,25,40,50,100,200 Their only common factor is 1.