Vivian found the LCM of 3 and 6. Her work is shown here.



Multiples of 3: 3, 6, 9, 12, 15, . . .

Multiples of 6: 6, 12, 18, 24, 30, . . .



The LCM is 12.





What was Vivian’s error?
The student needed to list more multiples for each number.
The student listed factors of each number instead of multiples.
The student should have multiplied 3 and 6 to find the LCM.
The student selected a multiple that is not the least of the common multiples.