1,2, 11, 22
The pairs are 1 & 22, 2&11 :)
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To find the factors that are not factors, find the factors of the number. All numbers that are not listed are not factors. 66: 1 x 66 2 x 33 3 x 22 6 x 11 The factors are 1, 2, 3, 6, 11, 22, 33, and 66. All other numbers are not factors of 66.
The common factors of 22 and 20 are: 1 and 2.
To find the factors of a number you first need to break it down into its prime factors. In this case, 44 is even so you can divide by 2. Do this and you get 22, which is also even. Divide by 2 again and you get 11 which is prime. Thus the prime factors of 44 are 2, 2 and 11. In order to find all the factors (other than 1) you multiply any combination of these prime factors together. In this case, the factors of 44 work out as: 1, 2, 4, 11, 22 and 44.
There cannot be a greatest common factor (GCF) 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 factors of 22 are 1, 2, 11, and 22The factors of 66 are 1, 2, 3, 6, 11, 22, 33, and 66