Least Common Multiple of 5, 10 and 14 by Listing Multiples

Multiples of 5: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, …
Multiples of 10: 10, 20, 30, 40, 50, 60, 70, 80, 90, …
Multiples of 14: 14, 28, 42, 56, 70, …
LCM(5, 10, 14) = 70