The first five multiples of 21 are: 21, 42, 63, 84, 105.
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21, 42, 63, 84, 105.
Factors: 1, 3, 7, 21 Multiples: 21, 42, 63, 84 and so on.
Since 10 is a multiple of 5, all multiples of 10 are multiples of 5.
Example: 5 and 7 List the multiples of 5. 5, 10, 15, 20, 25, 30, 35, 40... List the multiples of 7. 7, 14, 21, 28, 35, 42... The LCM is the first number that appears on both lists.
Multiples of 50 are the only numbers that are both. All other multiples of 5 aren't.