Well, the LCM is the smallest number that all the numbers divide into evenly. 4 has factors of 2 and 2. 7 has the factors of 1 and 7 ( prime ) and 14 has factors of 2 and 7. Well, the LCM of this numbers result of multiplying all the prime numbers the greatest number times they occur in either number. 2 time 2 times 7 equals 28. The LCM is 28. Hope this helped!