324 = 3 x 108 324 x 4 = 3 x 108 x 4
31
324 is 3*108
324*4 = (3*108)*4 = 3*(108*4) So, if you knew 108*4 you could multiply that number by 3 to get the answer to 324*4. But is it not at all clear why you would do that! First of all you need to work out the fact that 324 is actually 108*3 and then, multiplying 324 by 4 is really just as easy or difficult as multiplying 432 by 3. So one more step for no real gain.
105
The least common multiple of 81 and 108 is 324.
Since 108 is a factor of 324, it is automatically the GCF.
The GCF is 108.
324 x 4 = 1,296
0.0093
It would seem more sensible to do the multiplication directly.
108
The LCM is 3240.
108