Oh, dude, the least common multiple (LCM) of 28, 63, and 91 is 252. You just gotta find the prime factors of each number and then take the highest power of each prime factor that appears in any of the numbers. It's like a math puzzle, but with less excitement.
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It is 252
The GCF is 7.
The LCM is: 2,772
28 = 2 x 2 x 7 63 = 3 x 3 x 7 91 = 7 x 13 7 is the only common factor so is the highest common factor
The LCM is 378.