3
To find the GCF of two or more numbers you can find the factor pairs of each number and then find the factors they have in common.
9:
1 x 9
3 x 3
21:
1 x 21
3 x 7
The GCF of 9 and 21 is 3.
Chat with our AI personalities
The Greatest Common Factor of 21, 9 is 3.
The greatest common factor (GCF) of 21 and 9 is 3.
The GCF is 3.
The greatest common factor of 21 and 54 is 3. The greatest common factor is the highest number that divides exactly into two or more numbers. factors of 21: 1, 3, 7, 21 factors of 54: 1, 2, 3, 6, 9, 18, 27, 54 The greatest common factor of 21 and 54 is 3.
The GCF is 3.