It would seem more sensible to do the multiplication directly.
324 = 3 x 108 324 x 4 = 3 x 108 x 4
324 x 4 = 1,296
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.
81 multiplied by 324 is 26,244.
324
The product is 324
The product is 25,920
The product is 28,188
81*4 = 324
It is: 2*2*3*3*3*3 = 324
To find the number, multiply the factors. The answer is 324.