To make this easier, let's first factor 18 and 21 into their prime factors: 18=2*3^2 21=3*7 Now it's very easy to find the LCM and GCF. The LCM is 2*3^2*7=126, and the GCF is 3.
gcf(18, 21, 42) = 3. 18 = 2 x 3^2 21 = 3 x 7 24 = 2^3 x 3 hcf = 3
The greatest common factor (GCF) of 63, 21, and 7 is 7.
The GCF is 7.
The GCF is 7.
The GCF is 7.
The GCF is 7.
The GCF of 21 and 46 is 1.The GCF is 1.
The greatest, (Highest) Common Factor of 21 and 56 is 7
The GCF is 7.
The GCF is 7.
The GCF is 7.