#### Answer

42

#### Work Step by Step

The LCM, or Least Common Multiple, is the lowest number that is a multiple of all of the numbers listed. Recall, multiples of a number are all of the numbers that the number can be multiplied by a whole number to get. For instance, the multiples of 13 are 13, 26, 39… Thus, the Least Common Multiple of 14 and 21 is 42.