392.
The LCM is the Least Common Multiple, or the lowest multiples which all listed numbers share. So, list out the multiples of each number and choose the first match.
28: 28, 56, 84, 112, 140, 168, 196, 224, 252, 280, 308, 336, 364, 392
56: 56, 112, 168, 224, 280, 336, 392, 448, 504, 560, 616, 672
196: 196, 392, 588, 784, 980, 1176, 1372, 1568, 1764, 1960, 2156, 2352
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what is the lcm of 28 56 an 196
The GCF of 56, 196 and 252 is 28.
28
The LCM is: 196
The LCM is: 168