They all have square roots.
Square root of 1 is 1
Square root of 4 is 2
Square root of 9 is 3
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The least common factor of 4 and 9 is is: 1
The GCF of 4 and 9 is 1
The GCF of 4, 9, and 12 is 1.
The greatest common factor of the numbers 3, 4, 8 and 9 is 1.
The GCF of 4, 9, and 10 is 1.