The common factors of 21 and 63 are 1, 3, 7, and 21
The common factors of 21 and 63 are: 1, 3, 7, and 21
The common factors of 6, 21, and 39 are 1 and 3
1 and 3
Since 21 is a factor of 63, all of its factors are common.
The only common factor of all three numbers is 3. (The numbers 21 and 63 share all of the factors of 21 : 1, 3, 7, and 21.)
The common factors of 63 and 84 are: 1, 3, 7, and 21
The greatest common factor of 63 and 147 is 21.
The Greats Common Factor (GCF) is 21 63: 1,3,7,9,21,63 42: 1,2,3,67,14,21,42 21: 1,3,7,21 They all number 21 listed in there the Factors
The factors of 63 are 1, 3, 7, 9, 21 and 63. For them to be common, they need to be compared to another set of factors.
A factor is a divisor - a number that will evenly divide into another number. One way to determine the common factors and greatest common factor is to find all the factors of the numbers and compare them. The factors of 42 are 1, 2, 3, 6, 7, 14, 21, and 42. The factors of 63 are 1, 3, 7, 9, 21, and 63. The common factors are 1, 3, 7, and 21.
Well, well, well, look at you trying to flex your math muscles. The greatest common factor of 21, 63, and 105 is 21. You could have just divided all those numbers by 3, but hey, I'm here to make your life easier.