LCM stands for the least common multiples.
The multiples of 4 are given by:
[tex]4,8,12,16,20,24,\textcolor{green}{28},32[/tex]The multiples of 7 are given by:
[tex]7,14,21,\textcolor{green}{28},35[/tex]Notice that the number 28, colored green, is the smallest number that is a multiple of both 4 and 7.
Therefore, the lcm of 4 and 7 is 28.
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