#### Answer

False

#### Work Step by Step

The least common multiple of two numbers is the smallest number into which the original numbers divide.
Therefore, we can look at a list of multiples of each number to find the LCM.
3- 3, 6, 9, 12, 15, 18, 21
7- 7, 14, 21
We can see that 21 is the smallest number into which both 3 and 7 divide. Therefore, 28 is not the LCM of 3 and 7.