Write down multiples of each number until you find the first common multiple:

The multipliers of 33 are: 33, 66, 99, 132, 165, 198, 231, 264, 297, . . .

The multipliers of 66 are: 66, 132, 198, 264, 330, . . .

The multipliers of 88 are: 88, 176, 264, 352, . . .

We can see that:

LCM( 33, 66, 88 ) = 264

This solution can be visualized using a Venn diagram.

The LCM is equal to the product of all the numbers on the diagram.