Take the multiples of 3: 3, 6, 9, 12, 15, 18, 21, 24, etc.
Now, eliminate every fourth number in the sequence (the multiples of 4). The remaining numbers will be multiples of 3, but not of 4.
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Eliminate every fourth number in the multiples of 3.
3, 6, 9, 12, 15, 18, 21, 24, 27
The greatest common factor of the numbers 3, 4, 8 and 9 is 1.
4 is not a factor of 18 and is a factor of both 8 and 12
All numbers have factors. Some numbers have some of the same factors as other numbers. These are known as common factors. 3 is a factor of 9. 3 is a factor of 15. 3 is a common factor of 9 and 15.
All numbers have factors. Some numbers have some of the same factors as other numbers. These are known as common factors because they are factors that the numbers have in common. 3 is a factor of 12. 3 is a factor of 15. 3 is a common factor of 12 and 15.
1, as the three numbers only share 1 as a factor.