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108
4x27=108
4 x 20 = 80 4 x 7 = 28 80 + 28 = 108 4 x 27 = 108
To solve this problem, you would start by dividing 108 by 4, since the problem says that the product of the 4 and another number equals 108. By dividing 108 by 4, you get 27 as the second number. Now, you want the sum of the two numbers, so you add 4 and 27. The sum is 31.
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.