The GCF is 1.
The GCF is 1.
The GCF of 8, 18, and 70 is 2.
The GCF is 1.
The GCF is 3.
The GCF is 1.
The GCF is 2.
The GCF is 2.
The GCF of 312 and 18 is 6. The GCF of 3, 12 and 18 is 3.
The GCF of 3, 21, and 18 is 3.
It is: 2
The greatest common factor (GCF) of two numbers is the largest number that divides both numbers without leaving a remainder. To find the GCF of 18 and 21, you can list the factors of each number: 18 (1, 2, 3, 6, 9, 18) and 21 (1, 3, 7, 21). The common factors are 1 and 3, and the greatest common factor is 3.
gcf(18, 21, 42) = 3. 18 = 2 x 3^2 21 = 3 x 7 24 = 2^3 x 3 hcf = 3