-- All natural numbers.
-- All integers.
-- All real numbers.
-- All numbers less than 32.1 .
-- All positive whole numbers.
-- All numbers greater than 23.9 .
-- All numbers containing the digit ' 2 '.
-- All even numbers (multiples of 2).
-- All multiples of 4 .
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Common factors are found by comparing the factors of sets of numbers. The common factor of any group of consecutive numbers is 1. I suspect you might want to know the factors of those numbers rather than the common factors. If so, ask that question. It has been answered here many times before.
Some even numbers have more factors than some odd numbers and some odd numbers have more factors than some even numbers. As a group, even numbers have more factors than odd numbers.
Some even numbers have more factors than some odd numbers and some odd numbers have more factors than some even numbers. As a group, even numbers have more factors than odd numbers.
It is common to group factors in pairs with parentheses surrounding each pair.
The factors of 126 are: 1, 2, 3, 6, 7, 9, 14, 18, 21, 42, 63, 126 The factors of 154 are: 1, 2, 7, 11, 14, 22, 77, 154 The common factors are: 1, 2, 7, 14 The Greatest Common Factor: GCF = 14