53/7 * 28 = 38/7 * 28 = 38*4 = 152
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A factorial is a whole number multiplied by all the whole numbers less than that number. So 3 factorial (written as 3!) is 3 times 2 times 1=6
Multiply it by its reciprocal as for example 3/4 times 4/3 = 1
It means, it is a number which can be divided evenly into the larger number, an even number of times. Example 2 divides into 6 , 3 times evenly, a nice whole number like 3 which is what we are looking for. Not something like 3 1/8 or 3 1/2 times this over hanging fraction like what was just stated 3.125 or 3.250 would not be a whole nice number. But with some left over portion of a number we don't desire. Its the .125 or .250 part that bug us.
Yes 3 goes into 10387 - 3462.333333333333 times But note, it does not go into it a whole number of times, there is a remainder.
5 times with a remainder of 3