• you can express product of two numbers (x,y) as the area of a rectangle with side x and y, which may make it easier to solve like this.

• when you spilt a number x in x/2 and x/2, and then multiply them, you get the highest product than any other slipts, for eg.
  10 -> 5 * 5 = 25 will be biggest
  6 * 4 = 24
  7 * 3 = 21
  8 * 2 = 16
  9 * 1 = 9

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reference:- https://www.youtube.com/watch?v=0Ai9ygHu3L4