Find the greatest common factor (GCF) of 84, 126, and 210.
Note
Factor each number (84 = 2^2·3·7, 126 = 2·3^2·7, 210 = 2·3·5·7); common factors are 2·3·7 = 42, so GCF = 42.
Find the greatest common factor (GCF) of 84, 126, and 210.
Factor each number (84 = 2^2·3·7, 126 = 2·3^2·7, 210 = 2·3·5·7); common factors are 2·3·7 = 42, so GCF = 42.