The work that Yi did to find the greatest common factor of 42 and 63 is shown below. Factors of 42: 1, 2, 3, 6, 7, 14, 21, 42 Fa
ctors of 63: 1, 7, 9, 63 The greatest common factor is 7. What is Yi's error? Yi did not list all the factors of 63. Yi listed multiples for each number instead of factors. Yi did not list all the factors of 42. Yi found the least common multiple.
