Find Least Common Multiple of 84 and 320 by listing out the factors.
Answer
LCM( 84, 320 ) = 6720
Explanation
Write down multiples of each number until you find the first common multiple:
The multipliers of 84 are: 84, 168, 252, 336, 420, 504, 588, 672, 756, 840, 924, 1008, 1092, 1176, 1260, 1344, 1428, 1512, 1596, 1680, 1764, 1848, 1932, 2016, 2100, 2184, 2268, 2352, 2436, 2520, 2604, 2688, 2772, 2856, 2940, 3024, 3108, 3192, 3276, 3360, 3444, 3528, 3612, 3696, 3780, 3864, 3948, 4032, 4116, 4200, 4284, 4368, 4452, 4536, 4620, 4704, 4788, 4872, 4956, 5040, 5124, 5208, 5292, 5376, 5460, 5544, 5628, 5712, 5796, 5880, 5964, 6048, 6132, 6216, 6300, 6384, 6468, 6552, 6636, 6720, 6804, . . .
The multipliers of 320 are: 320, 640, 960, 1280, 1600, 1920, 2240, 2560, 2880, 3200, 3520, 3840, 4160, 4480, 4800, 5120, 5440, 5760, 6080, 6400, 6720, 7040, . . .
We can see that:
LCM( 84, 320 ) = 6720
This solution can be visualized using a Venn diagram.
The LCM is equal to the product of all the numbers on the diagram.