Common multiples of 7 and 5 include 35, 70, 140, etc.
Itself and any other multiples of 7
the next 5 multiples of 7 are: 14,21,28,35,42 and if you don't know the rest they are 49,56,63,70,77 and 84
5,10,15,20,25
Five multiples of 42 are 1, 2, 6, 7, 21, 42.
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.
The list is infinite. 35, 70, 105 etc
Multiples of 5 include 5, 10, 15, 20 and so on. For them to be common, they need to be compared to another list of multiples.
5,10,15,20 and 25
Multiples of 7 include 7, 14, 21, 28 and so on. For them to be common, they need to be compared to another set of multiples.
That's an infinite list.
This is done by multiplying 7 by the first 5 natural numbers.So we have 7x1=77x2=147x3=217x4=287x5=35
Common multiples of 7 and 5 include 35, 70, 140, etc.
7, 14, 21, 28
Itself and any other multiples of 7
the next 5 multiples of 7 are: 14,21,28,35,42 and if you don't know the rest they are 49,56,63,70,77 and 84
Since all 3 are prime numbers LCM = 3 * 5 * 7 = 105 All multiples of 105 are multiples of 3, 5 and 7