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The factors of 48 are 1,2,3,4,6,8,12,16,24 and 48. You need another set of factors to compare them with to find a GCF.
F12 on the Internet lets you change the website to how you want it to look and you can block cookie's and much more. See the related link. If you press F12 on the Google home page you could add text to anywhere on the web page.
The factors of 20 are 1,2,4,5,10 and 20. For them to be common, they need to be compared to another set of factors. There cannot be a common factor of just one number. To be common there need to be at least two numbers. If you find all the factors of two or more numbers, and you find some factors are the same ("common"), then the largest of those common factors is the Greatest Common Factor.The factorsof 20 are 1, 2, 4, 5, 10, 20. For them to be common, they need to be compared to another set of factors.
The factors of 57 are 1, 3, 19, and 57. For them to be common, they need to be compared to another set of factors. You need at least two numbers to find a GCF.
All numbers have factors. Some factors are prime numbers. These are known as prime factors. The set of prime factors is a subset of the set of factors for any given number.